Neanderthals nursed their sick and injured back to health with ancient medicine; Listen to the Antarctic ice sheet sing a song of melting ice; There's a catch to 'catch and release:' hook injuries interfere with fish feeding; Purple reign: life on Earth might once have been dominated by purple micro-organisms; Evolution is going uptown as plants and animals adapt to city life; Why is the sound we hear in two ear buds not twice as loud as the sound from one?