A Japanese spacecraft visits an asteroid - and will bring back a souvenir; "Weird wonders" in China - new half-billion year-old fossils from the dawn of animal life; Your gut bacteria are actively involved in your emotions, how you think, and even behave; Our farming ancestors are the reason we can say 'f' words today; Mysterious green icebergs from Antarctica might be fertilizing the southern ocean; How long does it take to dream a dream?