Smoothly layered kinetic sand displayed in a clear glass with bold color contrast ...

See **how to build stairs** to a unique **pool** made of nothing but **sand** and **dirt**! This **building** project is a truly **satisfying science**. Check out those perfect **nodal lines**!

In ancient Egypt, what was the Sphinx all about? – Effie, age 8, New Plymouth, New Zealand. One of the most mysterious and ...

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