Fun with Science for the Weekend

My kids love science. Hell, so do I. The world is an incredible place to discover.

Here are a few super-easy projects you can do with items most likely in your house already:

Transform an egg. Place an egg into a jar of vinegar in your fridge for three days to see the transformation. The easiest experiment ever.
Make butter. Just put heavy cream and a marble into a small jar and shake. In under 10 minutes, you will have homemade butter for everyone to enjoy.
Make Oobleck, a slime that changes consistency based on pressure made out of cornstarch and water. I had as much fun as my kids playing with this.

What are your favorite easy science projects for your kids? Please share!