The following video include science tricks that you can do with your children. I tried to be very selective in finding ones that use household items and are relatively safe.
Although if these experiments are performed by children, there should be a responsible adult present to supervise. Finally, you do these experiments at your own risk.
Amazing Eggs And Science
Dozen Nails Trick
Water Defies Gravity
Chill A Coke In 2 Minutes
Requires: a bowl, milk, food coloring, q-tips and dish soap.