Michael Wall joins the program. Wall is a senior writer for Space.com. He has just written OUT THERE...A Scientific Guide to Alien Life, Antimatter and Human Space Travel (for the cosmically curious) . Wall explores the myriad of questions that would arise once we do discover life beyond Earth. Like: what would the first aliens we meet look life? Little green men or microbes? It's part science, part humor, and it's already a bestseller.