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Instant Greenhouse -- give each child a quart size zip-top bag, a paper napkin, and a handful of seeds. We like a mixture of seeds, some small, some larger.

Put the napkin into the bag and smooth it out. Use a stapler to put a row of 6 to 10 staples across the bag, parallel with the zip-top. Drop the seeds into the bag (above the staples) and add about a tablespoon of water. Tape the bag to a window, and in a few days you will see the first sprouts. Add water ONLY when the napkin dries out. Also, it will 'burn' if you put the bag between the glass and a curtain -- it traps the heat and will scorch the seeds.

You can vary this for an experiment by using different amounts of water, windows on different sides of the room, away from the window, different seeds, etc.

Check out this site...www.kidsgardening.com

Good luck.