Specialized cells have a common origin. What sets them on separate paths?
Seasoned gardeners depend on a community of bacteria, worms, and insects to get the most out of their plantings. Find out why.
A face seen upside down may hold some surprises.
Answers to questions you've asked.
This toy uses components of force to walk and to stop at just the right time!
Whirling water creates a tornado in a bottle.
Make a lens and a magnifying glass by filling a bowl with water.
Rotating water has a curved surface.
Go ahead - hit it hard!
Using two eyes gives you depth perception.
You can see the spring, but you can't touch it.
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