- Did you know... fresh egg will sink in fresh water. A stale egg will float.
- Did you know... sound travels 4.3 times faster in water than in air. Of course, it doesn't travel through a vacuum at all.
- Did you know... about 78% of the average human brain consists of water.
- Did you know... the hardest chemical in your body is your tooth enamel.
- Did you know... the ethylene gas produced by a ripening apple ripens other apples as well as many other types of produce.
- Did you know... water expands about 9% when it freezes into ice.
- Did you know... Mars is red because its surface contains a lot of iron oxide or rust.
- Did you know... it's possible for hot water to freeze more quickly than cold water.
- Did you know... liquid oxygen is blue.
- Did you know... fish scales are a common lipstick ingredient.
- Did you know... lemons contain more sugar than strawberries, for the same mass.
- Did you know... some lipstick contains lead acetate or sugar of lead. This toxic lead compound makes the lipstick taste sweet.
more: Did You Know
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