AhaBulbStuff Everyone Should Know

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AhaBulb Everyone

One card a day of stuff everyone should know: cars, money, home, safety and more, with a dad joke on every card.

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  1. Is premium gas better for your car?
    Show the answer

    Only if your fuel door or manual says premium required. Octane is knock resistance, not extra energy. AAA found no gain in power, mileage or emissions in cars built for regular. Use what your fuel door or manual says.

  2. Does a bigger charger charge faster?
    Show the answer

    Only up to a point: your phone decides the speed. The charger offers power and the phone takes only what it can handle. One 40-watt USB-C PD charger runs most phones and tablets at top speed.

  3. How much air goes in your tires?
    Show the answer

    The number on the sticker in the driver's door jamb. The number on the tire is the maximum it can hold. Your carmaker's number is on the door jamb sticker. Check it cold, once a month.

All 306 practice questions

Each one has the answer, why it's right, and the official sources. Or play them as a game and track what you've learned.

Show all 306 questions
  1. Is premium gas better for your car?
  2. Does a bigger charger charge faster?
  3. How much air goes in your tires?
  4. How much toothpaste should you use?
  5. Is a password enough?
  6. How long should you wash your hands?
  7. How much Halloween candy should you eat?
  8. What gas goes in your lawn mower?
  9. Thanksgiving's over. When do the leftovers go in the fridge?
  10. How often do you replace the smoke alarm itself, not just the battery?
  11. It's 25°F outside. How long do you warm up a modern car?
  12. You're lost on a hiking trail. What do you do?
  13. A thunderstorm chases you away from the campfire. When is it safe to go back out?
  14. You find a tick stuck in your skin after a hike. What's the best way to get it out?
  15. Time to leave camp. What's the right way to put out the campfire?
  16. Your only water at camp comes from a creek. How long should you boil it before drinking?
  17. You're at the lake all day. How often should you put on more sunscreen?
  18. A friend's fingers are numb, pale, and frostbitten. How should you warm them up?
  19. How often should you clean the lint filter in your clothes dryer?
  20. A pan of grease catches fire on the stove. What should you do?
  21. Your carbon monoxide alarm starts beeping. What should you do first?
  22. What is the main fire hazard of running an extension cord under a rug?
  23. What temperature should most home water heaters be set to?
  24. How long does a 15-pound frozen turkey need to thaw in the fridge?
  25. Should you rinse raw chicken in the sink before cooking it?
  26. How hot does the inside of a hamburger need to get to be safe to eat?
  27. Where is the best place to keep eggs in the fridge?
  28. What does a "Best if Used By" date on food mean?
  29. What happens to your credit score when you check it yourself?
  30. A stranger sends you a check and asks you to send part of the money back. Your bank lets you spend it the next day. What does that mean?
  31. Which of these counts the MOST in your FICO credit score?
  32. What is U.S. paper money mostly made of?
  33. A caller says they're from the IRS and you owe taxes. How does the real IRS normally contact you first?
  34. A caller says you owe money and must pay right now with gift cards. Which of these would ever ask you to pay that way?
  35. A pop-up says 'Microsoft Alert: Virus found! Call this number now.' What's true?
  36. There's a QR code sticker on the parking meter. What's the smart move before you pay?
  37. Is it okay to check your bank account on coffee shop Wi-Fi?
  38. Grandma gets a call that sounds exactly like her grandson: he's in trouble, needs money now, and says not to tell Mom. What should she do first?
  39. How often should you take a break from sitting at your desk?
  40. Where should the top of your computer screen be for the best posture?
  41. Why is it hotter in the summer and colder in the winter?
  42. Does water flush down the toilet in the opposite direction in Australia?
  43. Is the glass in old windows thicker at the bottom because glass slowly flows down?
  44. Is there zero gravity in space where the space station orbits?
  45. What happens if you leave a penny on a railroad track and a train hits it?
  46. Can you catch a cold just from going outside with wet hair in winter?
  47. What time of day is best to water your lawn during the summer?
  48. What kind of plunger are you supposed to use to unclog a toilet?
  49. Will setting the heater to 90 degrees usually warm a cold house faster?
  50. What happens if you mix bleach and ammonia to clean a really dirty bathroom?
  51. Should you run hot or cold water while using a garbage disposal?
  52. How much of the grass blade should you cut at one mowing?
  53. What does private or incognito browsing actually hide?
  54. What is the best thing to do if you drop your phone in water?
  55. Does routinely swiping away smartphone apps save battery?
  56. When buying a camera, does having more megapixels mean the photos will look better?
  57. Can a typical refrigerator magnet erase the hard drive on a laptop?
  58. Is the 5G signal on your cell phone the same as 5G Wi-Fi at home?
  59. How much sleep does a healthy adult need each night?
  60. When should you turn off screens before bed?
  61. Does SPF 30 mean you can stay in the sun 30 times longer?
  62. Is any sunscreen really waterproof?
  63. If there is no soap, what hand sanitizer should you use?
  64. How much sleep does a school-age kid need?
  65. If your clothes catch fire, what do you do?
  66. After you put on hand sanitizer, what next?
  67. When do you put sunscreen on before going outside?
  68. How often should you replace a toothbrush?
  69. What is the best sun plan for a baby under 6 months?
  70. How can a penny tell you a tire is too worn?
  71. How often should you check tire tread?
  72. What temperature is generally considered a fever?
  73. Where should you keep medicine for best shelf life?
  74. At what UV Index should you start protecting your skin?
  75. Where should the front of a bike helmet sit?
  76. Most kids need a booster seat until about what height?
  77. Before crossing a street, what should you do?
  78. If the check engine light is flashing, what should you do?
  79. What does the small arrow by the fuel gauge show?
  80. When should headlights be on during rain?
  81. What should you use to wash an apple before eating it?
  82. What is the highest recommended temperature for your refrigerator?
  83. Where should raw meat sit while it marinates?
  84. After thawing raw meat in the microwave, when should you cook it?
  85. How long can properly handled cooked meat leftovers stay in a fridge at 40°F or below?
  86. What do freezer storage time limits usually describe for food continuously kept at 0°F or below?
  87. Is homemade cookie dough safe to eat raw if you leave out the eggs?
  88. A text says your bank account is locked. How should you check?
  89. Does a familiar caller ID prove who is calling?
  90. An unwanted sales robocall offers a button to stop calls. What should you do?
  91. Why install phone software updates even when you do not want new features?
  92. During a common nosebleed, which way should you lean while sitting up?
  93. What should you put on a small, minor heat burn first?
  94. Floodwater covers the road ahead. What should you do?
  95. A tornado warning reaches your house. Where should you go?
  96. Someone falls and shakes during a seizure. How should you help?
  97. After telling 911 what happened, when should you hang up?
  98. When typing, how should your wrists line up with your forearms?
  99. Where should your computer mouse sit?
  100. Your desk chair leaves your feet dangling. What helps?
  101. On a PC, which shortcut usually undoes the last typing action?
  102. Which PC shortcut helps you find a word in a long document?
  103. Under federal law, can a shop refuse cash?
  104. The dog chewed a $20 bill, but more than half is left. Is it still worth anything?
  105. You find a personal check from 8 months ago. Does the bank have to pay it?
  106. How much does it cost to freeze your credit at the credit bureaus?
  107. You lose your debit card. How fast should you report it to cap your loss at $50?
  108. Your credit card bill has a "Minimum Payment Warning" box. What does it tell you?
  109. A two-week payday loan charges $15 for every $100. What yearly rate (APR) is that?
  110. A one-time debit card purchase overdraws your account. Can the bank charge an overdraft fee?
  111. You co-sign a friend's loan, and they stop paying. How much could you owe?
  112. Will closing an old credit card you never use raise your credit score?
  113. Tired of "You're pre-approved!" credit card offers in the mail? What's the quickest way to stop them?
  114. Where should you keep your Social Security card?
  115. A 6-year car loan has lower monthly payments than a 3-year loan. What's the catch?
  116. A company offers to find your unclaimed money for a fee. Do you need them?
  117. You pay a stranger with an app linked to your bank, and the item never comes. Can you get the money back?
  118. About how long does a $1 bill last before it wears out?
  119. In Yellowstone, how far should you stay from a bear or a wolf?
  120. On a hike, is it OK to toss your apple core or orange peel into the bushes?
  121. Which bug spray ingredient is on the CDC's mosquito repellent list?
  122. Two hikers meet on a narrow, steep trail. Who has the right of way?
  123. Your day hike should end by lunch. Which item still belongs in your pack?
  124. A wild mushroom looks just like the ones from the store. Is it safe to eat?
  125. A rip current is pulling you away from the beach. Which way should you swim?
  126. Can you get a sunburn on a cloudy, cool day?
  127. What does someone in trouble in the water usually look like?
  128. What starts most wildfires in the United States?
  129. You put a fallen baby bird back in its nest. Will the parents reject it because you touched it?
  130. You find a fawn lying alone in tall grass. What should you do?
  131. How thick should new, clear ice be before you walk out on a lake?
  132. Does a drink of alcohol help warm you up in the cold?
  133. When is the best time to check your tire pressure?
  134. How often does your car really need an oil change?
  135. About how much gas does a car burn just idling for an hour?
  136. At what speed does your gas mileage usually start dropping fast?
  137. How much can an extra 100 pounds of stuff in your car cut your gas mileage?
  138. Does cracking the windows keep a parked car cool on a warm day?
  139. Stuck in your car in a snowstorm with the engine on for heat. What must you keep clear?
  140. How can you find out if your car has an open safety recall?
  141. When the outside temperature drops 10°F, about how much does tire pressure drop?
  142. You put on the small "donut" spare. How should you drive on it?
  143. The gas pump clicks off. Should you squeeze in a little more to round it up?
  144. Which action can create a static-spark risk while you refuel?
  145. There's a thunderstorm outside. Which phone is risky to use indoors?
  146. What is the 3-2-1 backup rule for your photos and files?
  147. What temperature range do many phones work best in?
  148. In an emergency, when should you text 911 instead of calling?
  149. Your phone is dying at the airport. What's the safest way to charge it?
  150. How often does the NSA suggest turning your phone off and back on?
  151. Does charging a modern phone overnight automatically ruin its battery?
  152. A website shows a padlock and https. What does that tell you?
  153. Does lightning ever strike the same place twice?
  154. You're inside a hard-topped car in a lightning storm. What protects you?
  155. You see lightning, then count 10 seconds until thunder. About how far away was it?
  156. How hot can lightning heat the air around it?
  157. Why is the sky blue on a sunny day?
  158. Is it true that bats are blind?
  159. What does a camel store in its hump?
  160. A scared ostrich can't run away. What does it really do?
  161. The rain just stopped and you want to spot a rainbow. Where should the sun be?
  162. A tornado is coming while you're on the highway. Is hiding under an overpass safe?
  163. Is the "dark side of the moon" always dark?
  164. Camping high in the mountains, why does your pasta take longer to cook?
  165. The package says the wipes are "flushable." Is it OK to flush them?
  166. You're done cooking bacon. Where should the leftover grease go?
  167. Viewed from below in summer, which way should your ceiling fan spin?
  168. Turn your thermostat back 7 to 10 degrees for 8 hours a day. How much could you save?
  169. How can you find out if your home has radon?
  170. Does cracking your knuckles give you arthritis?
  171. You have a bad cold. Will antibiotics help you get better faster?
  172. Does shaving make hair grow back thicker or darker?
  173. Does reading in dim light damage your eyes?
  174. Can a flu shot give you the flu?
  175. How long, and how often, should you brush your teeth?
  176. For healthy ears, what's the best routine way to clean wax from the ear canal?
  177. Your eyes feel tired after a long time on a screen. What's the eye doctors' break rule?
  178. Dinner's done and you have hot chili left. Must it cool on the counter before refrigeration?
  179. You're thawing a sealed pack of frozen meat in cold water. How often should you change the water?
  180. You drop a snack on the floor and grab it in 2 seconds. Are germs on it yet?
  181. Your block of cheddar has a small spot of mold. What should you do?
  182. A can in your pantry is bulging at the top. What should you do?
  183. Speeding, jackrabbit starts and hard braking on the highway. How much gas mileage can that waste?
  184. Road trip! A big rooftop cargo box at Interstate speeds can cut your gas mileage by up to about how much?
  185. In city driving at 20°F, about how much lower is a gas car's mileage than on a 77°F day?
  186. The pump says E85. Which vehicles are built to run on it?
  187. On a modern fuel-injected car, what does replacing a clogged air filter mainly improve?
  188. A used car's Buyers Guide sticker says 'As Is, No Dealer Warranty.' What does that mean?
  189. You buy a car from a dealer and regret it the next day. Does federal law give you 3 days to return it?
  190. Your car is under warranty. Do you have to get oil changes at the dealer to keep it?
  191. For every 1 psi your tires drop below normal, about how much gas mileage do you lose?
  192. Your owner's manual says 5W-30 oil, but the shop puts in thicker 10W-30. What can happen?
  193. After you file your taxes, how long does the IRS generally say to keep the records behind them?
  194. For most people, when is the usual deadline to file federal income taxes?
  195. You e-file your tax return and you're owed a refund. About how long does it typically take?
  196. Your health plan has a $2,000 deductible. What does that mean?
  197. Your credit card bill has an error. When must your written dispute reach the issuer for federal protections?
  198. Two jars of peanut butter, different sizes. Which number on the shelf tag shows the better deal?
  199. Under federal law, how long must the money on a store gift card last before it can expire?
  200. A 'free trial' doesn't clearly say whether it turns into a paid plan. What does the FTC say to assume?
  201. Does the blue light from phones and computers damage your eyes?
  202. Can a product's warranty require you to use only the maker's own brand of parts, like printer ink, to stay valid?
  203. You Bcc someone on an email. What can the other recipients see about that Bcc recipient?
  204. You share a photo from your phone. What hidden info might go along with it?
  205. Your new 1 TB drive shows up in Windows as about 931 GB. Why?
  206. Should you let your phone's lithium-ion battery run all the way down before charging it?
  207. You're storing a tablet long term. About how charged should its battery be?
  208. Do Wireless Emergency Alerts require an app or sign-up?
  209. Where's the best spot for your home Wi-Fi router?
  210. What's the best way to stop a TV or dresser from tipping over onto a kid?
  211. The TV screen is covered in fingerprints. What should you clean it with?
  212. You put your number on the National Do Not Call Registry. When does that registration expire?
  213. Your old phone has a removable SIM. Before selling it, what should you take out?
  214. Which phone accessory belongs in a basic emergency supply kit?
  215. What normally keeps sewer gas from coming up through a sink drain?
  216. Which water heater part lets water or steam escape if the tank gets too hot or the pressure too high?
  217. A GFCI outlet keeps tripping or will not reset. What is the safest next step?
  218. When installing a furnace filter, which way should its airflow arrow point?
  219. What usually cleans brushes and rollers after using latex or acrylic paint?
  220. Before applying fresh bathroom caulk, what condition should the surface be in?
  221. Which hand tool is designed to work through sink and tub drain traps and bends?
  222. What monthly upkeep can keep dust from blocking a smoke alarm sensor?
  223. Which mower-blade condition helps grass keep growing vigorously?
  224. Where should mulch stop around a landscape tree?
  225. How small a round hole can a mouse squeeze through?
  226. Before changing a power-tool blade or bit, what should you do first?
  227. How often does the U.S. Fire Administration say a professional should inspect and clean a chimney?
  228. What should you disconnect from outdoor water spouts before freezing weather?
  229. Which drastic pruning practice does the U.S. Forest Service say harms trees?
  230. Before using any pesticide, what should you read first?
  231. What should be cleared from an outdoor air-conditioning unit?
  232. What fuel step does Utah State suggest when winterizing a lawn mower?
  233. Someone collapses and won't answer you. How long should you spend checking if they respond?
  234. Which thrust does the Red Cross use when a choking person is known to be pregnant?
  235. A choking infant becomes unresponsive. What should you begin after placing them on a firm, flat surface?
  236. During a severe hailstorm, where should people inside a building move?
  237. How can a closed bedroom door help during a home fire?
  238. Why does even a small electrical burn need professional medical evaluation?
  239. Someone inhales a poison. What is the first action if you can do it safely?
  240. Indoors during earthquake shaking, what three actions should you take?
  241. How should you enter unknown or shallow natural water?
  242. During a life-jacket fit check, how high should it rise when lifted at the shoulders?
  243. Why does CPSC say to keep toys and remotes off the top of a TV or dresser?
  244. Can an ordinary window screen prevent a child from falling out?
  245. Should a bicycle helmet be reused after it was involved in an accident?
  246. Where is it safe to use charcoal for cooking or heat?
  247. Backpacking overnight in Yosemite's wilderness, how must you store your food?
  248. What is the easiest safe way to keep track of dozens of strong, different passwords?
  249. Your credit is frozen. Can you open a new credit card yourself?
  250. Does federal law make your employer give you paid vacation days?
  251. A bear on the trail sees you and starts walking your way. Should you run?
  252. Can climbing a tree keep you safe from a black bear or a grizzly?
  253. Which of these is on the National Park Service's Ten Essentials list for hikers?
  254. Hiking all day in summer heat, what should you eat along with drinking your water?
  255. On a shared trail, a mountain biker meets a hiker. Who should stop and step aside?
  256. Under Bitterroot National Forest's order, how high and how far from a tree must hanging food be?
  257. Can scratching a poison ivy rash spread it to new places on your body?
  258. You're hiking a dry, sandy canyon bottom under clear blue skies. Can a flash flood still reach you?
  259. To pass along Lyme disease, about how long does a tick usually have to stay attached?
  260. Doing a tick check after a hike, which spots are easy to miss?
  261. Your group is caught outside in a lightning storm with no shelter nearby. What should the group do?
  262. At Tuzigoot National Monument in Arizona, how much space should you give a rattlesnake?
  263. Sledding on a sunny winter day, about how much of the sun's UV light can snow bounce back at you?
  264. In a SIM swap scam, what does the crook trick your phone company into doing?
  265. A covered, nonexempt worker logs 45 hours one week and 35 the next. Do they earn overtime?
  266. What is the federal youth minimum wage during a worker's first 90 days with an employer?
  267. Your boss gives you a 15-minute break. Under federal law, does that time count as paid work time?
  268. Who generally qualifies for unemployment insurance benefits?
  269. Why do your ears pop when a plane climbs or descends?
  270. How long can raw chicken safely stay in the refrigerator before cooking or freezing?
  271. What is the best way to refrigerate a very large pot of hot soup?
  272. What does it usually mean when a whole egg floats in water?
  273. Where should raw meat, poultry and seafood go in the refrigerator?
  274. Which cutting board habit helps prevent cross-contamination?
  275. You want to use leftover marinade that held raw meat as a sauce. What should you do first?
  276. Does freezing food at 0 degrees F kill most bacteria?
  277. Which fire extinguisher class is made for cooking oil fires in cooking appliances?
  278. Why is a sharp kitchen knife usually safer than a dull one?
  279. How does soap help remove oil and grease from hands?
  280. How does a refrigerator keep food cold?
  281. What causes the sound of thunder?
  282. Which weather measurement best describes how muggy it feels outside?
  283. Before staying home alone, whose number should a child have?
  284. What water temperature usually helps prevent dark clothes from fading?
  285. What should you do if you drop a kitchen knife?
  286. What security feature appears on a current-design $20 note?
  287. What does the Total Sugars line on a Nutrition Facts label include?
  288. Why should children and teens avoid aspirin during a viral illness?
  289. About how much sunscreen should an adult use for exposed skin?
  290. When sitting at a computer, how should your elbows be positioned?
  291. The eye of a hurricane brings sudden calm. Is the storm over?
  292. On a Windows PC, a fake virus pop-up traps your browser. How can you close it without touching the pop-up?
  293. An online sweetheart you have never met asks for emergency money. What should you do?
  294. After scanning a QR code, what should you check before opening the link?
  295. A simple game wants your contacts, photos, and location. What is the privacy-smart response?
  296. You changed a new router's Wi-Fi password. Which other default password may still need changing?
  297. An hourly employee answers work calls throughout an unpaid lunch. Under federal rules, what is that time?
  298. A job ad says applicants must be under 35. Which age group does federal age-discrimination law protect?
  299. A contract calls a worker an independent contractor. Does that label alone settle the worker's federal tax status?
  300. Does the serving size on a Nutrition Facts label tell you how much you should eat?
  301. You subtract expenses from income and get minus $8. What does that show?
  302. When sewing on a flat button, why put a pin under the first stitch?
  303. The metal hook on a tape measure wiggles slightly. Is it broken?
  304. How does your phone's GPS figure out where you are?
  305. What is at the center of nearly every cloud droplet?
  306. Why are town water tanks often built high above the ground?