If you live in an apartment like us and don't have any soil to plant in, this is a great way to teach about sustainability and growth. Kids will love spritzing the "soil" in the box every day (which is all you need to do) and seeing the edible mushrooms appear in just ten days.
Their website also has some free mushroom coloring pages.
Look for them at your local Whole Foods or pick one up at their website.
(Image: Back to the Roots)