Card number: #0036
Why do turtles live so long? Do they have any natural predators?
Today's Why
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Card number: #0030
Why does the Moon always show Earth the same face?
Card number: #0029
Why does butter go rancid over time, but olive oil doesn't?
Card number: #0028
Why does lake ice form from the surface down, not from the bottom up?
Card number: #0079
How many lifetimes would it take to read every book ever written?
Card number: #0055
If everyone in the world wanted to withdraw all their money in cash, how much would be missing?
Card number: #0025
How does a gyroscope work, that it doesn't just tip over?
Card number: #0024
How did people tell time at night in the ancient world, before clocks existed?
Card number: #0023
What would happen to Earth's orbit if the Sun suddenly vanished?
Card number: #0022
How did the builders of Gothic cathedrals do their calculations without calculators or decimal numbers?
Card number: #0021
How does a forest know when to bud in spring?
Card number: #0020
How do scientists date a mountain without having been there when it formed?
Card number: #0019
Why doesn't aluminum rust as visibly as iron?
Card number: #0018
Why does your nose run when you cry?
Card number: #0017
Why does Saturn have the most striking rings of any planet?
Card number: #0016
Why are coins and banknotes worth almost nothing in themselves, yet we buy things with them?
Card number: #0015
Why don't the magnetic and geographic north poles line up?
Card number: #0014
How do birds find their way on migrations spanning thousands of miles?
Card number: #0013
Why do we yawn when we see someone else yawn?
Card number: #0012
Why do dogs circle before lying down?
Card number: #0011
How did people survive common infections before antibiotics?
Card number: #0010
Why does time seem to speed up the older we get?
Card number: #0009
Why do zebras have stripes?
Card number: #0008
Why do onions sting your eyes, but garlic doesn't?
Card number: #0007
How do whales and dolphins avoid forgetting to breathe while they sleep?
Card number: #0006
Why can't we tickle ourselves?
Card number: #0005
Why do some languages have grammatical gender, even though objects have no sex?
Card number: #0004
Why does almost no one remember the first years of their life?
Card number: #0003
Why is the sky blue, but sunsets red?
Card number: #0002
How much protein could an ordinary peasant in medieval Europe realistically eat in a day?
Card number: #0001
Can a snake bite its own tongue?
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