Pros: great concept, liked the experimental journal, good exposure to scientific methods
Cons: didn't perform as expected
son was so excited, but when we tried to get car going,did not perform as expected. When we shook it for the suggested time, it would only go a few inches at most. after many tries, my husband, a scientist, was able to get it to go about 20 feet. The time suggested to shake the car seemed way too long. When he reduced it to a couple of seconds, that is when it was able to go.