Why do wasps become more aggressive after you kill one of the hive members? The answer is the same reason why you should be wary of bees that smell like bananas. Here's another question: Why does some metal rust? This week, Reactions answers viewers' chemistry questions like these with some short and sweet chemistry. Check out the video here: https://www.youtube.com/playlist?list=PLtLT74crQcwWo-JRKEkE2RFGdol4SkoJS.