I am not good at chemistry nor biology, but after I saw the clips of these biology videos, I became very interested. Since I am a middle school student, I knew some part of the videos but I never knew that carbon can bond with lots of other molecules, etc. Though it was very hard for me to understand the bonding rules and what Cavendish had discovered. And I think though I couldn't understand the whole part so I had to rewind the videos just as the men in the video said, but still it was very fun and I really enjoyed it. I recognized some parts of the video and the experiments.