Discover why the sky is blue and the sunset is red.

Turn an old CD into a spectroscope to analyze light.

¡Descubre la “coincidencia cósmica” que hace posible los eclipses solares!

Discover the “cosmic coincidence” that makes solar eclipses possible!

Try a new tilt on eclipses.

Prove to yourself that Galileo was right.

Just spew it—build your own cyclic hot water fountain.

Why is the sky blue? That's a sticky question.

Watch the rise and fall of hot and cold fluids.

The hunt for life in other parts of the universe is on—but how are scientists going about it, and what does it mean to discover life, anyway?