YouTube star Charlie McDonnell a.k.a charlieissocoollike joins us to talk about his love for all things science! Charlie was the first YouTuber in the world to reach 1 million subscribers and his latest videos answer science questions, like why do we find stuff cute? He's written a book called Fun Science too, which explores "the best and most interesting things that science has to offer" (a bit like us!)

Plus, Sean and Robot explore how boats are designed so they don't capsize, we find out about a super cool, bionic hand being developed in Italy, and we discover the answer to why we sometimes get the feeling of butterflies in our tummies!