You shouldn't do experiments using blood with children unless you are prepared to instruct them in handling biologically hazardous materials. You would need gloves and a disposal mechanism because blood is considered to be a hazardous substance. You cannot throw it away in the usual manner. You need a biohazard bag and a disposal company willing to accept it. This can be quite costly. In the past, we would do blood typing with kids, now it is more difficult because of the number of children who are not with their biological parents. It would be awful if one of the kid's blood types were not compatible with the blood types of their "parents".
Some good science projects for kids are: - Oil and water - Put a egg in salt water and see what happens - Which ice cube will melt the fastest? One with pepper on it. One with salt on it and a regular ice cube Source: a science projects for kids book Try the Make it Work Series by World Book. They have a lot of great and fun science project for kids.
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