The things that go BOOM! We take a look at the science behind thunder and lightning. Next, Lester and Kate the Chemist team up together for their very own science project called, vomiting watermelons! Also, Jimmy Fallon, the comedian, joins us with silly string and all. Jimmy shares some of his secrets to making kids and grown-ups laugh. Plus we talk about what you need to know about how to care for a puppy after adopting one!