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Leak-Proof Bag - Kid's Science Experiment

Air pressure experiment

Science experiment for preschoolers with Mentos and diet soda to teach them about gas molecules. Looks so fun!

Make Magic Sand - build castles under water - the sand stays dry!!!! This site has fabulous science projects.... I love this guy!!!! He's on Ellen

37 Activities Under $10 That Will Keep Your Kids Busy On A Snow Day

37 activities that will keep the kids busy this winter. I particularly like this target for paper airplanes.

16 Super Fun Summer Activities for Kids

Glow in the Dark Bowling | 16 DIY Summer Activities for Kids Outside | Fun Summer Ideas for Kids Outside Games

Mentos Geysers

Mentos Geyser -- I've done this at a couple of parties and both kids and adults always get a kick out of it. Lots of fun, cheap, and VERY easy! I have the "geyser tubes" made just for this and it makes everything easier. They're often on sale after summer or after holidays if they're marked as stocking stuffers.