Water has secret identities.
Lots of things that look solid are made up mostly of water. Tomatoes are 90 percent water. Apples, pineapples, and ears of corn are each 80 percent water. And an adult human body is composed of about 60 percent water.
Water is a power player.
Cold water makes you chill.
Literally! Drinking cold water can stimulate your vagus nerve. (Nerves are bands of fibers that carry messages from your brain.) The vagus nerve connects to many organs, including your heart. And when the nerve is activated, it tells a racing heart to slow down.
H20 was once a UFO.
How did water get on Earth? Many scientists think that it arrived on asteroids or comets billions of years ago. Asteroids and comets contain ice, so ones that smashed into our planet could have deposited frozen water molecules that eventually liquefied.
Water is weird.
Hot water freezes faster than cold water. Hot and cold water also make different sounds when poured. And water doesn't always turn to ice, even after its temperature has dropped below freezing.
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