Well, somedays just aren't great for being outdoors. Maybe it's too hot or muggy or rainy. That's a great day for a budding scientist to grow some crystals. It's simple and you only need a few things...
Growing Crystals
All you'll need is:
Two glass jars
A pencil
Nylon thread
Water
Alum (found in grocery stores in the spice section).
Then you'll need some patience as it takes a few days for the crystals to really grow. Find the complete instructions over at Scribbit.
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I love growing crystals. Alum's crystals are especially fun because of their shape. Epsom salt is another fun crystal to grow.
ACS recrystallizing experiment outline (pdf)
The American Chemical Society has a great repository of experiments at http://www.acs.org/kids.
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