Rocking good sleep, music and body language, the first feathers for flight, Where's my death ray? A 300 million year old fossil walks again and sound in cold air.

Quirks and Quarks

Rocking yourself to sleep improves sleep quality and memory - even in grownups; Body language could be the secret behind the sweetest music; The first feathers for flight? A 160 million year old dinosaur might have had them; How to build a death ray - a new book looks attempts to make the ultimate weapon; A Robot reconstruction of a 300-million-year-old fossil shows how it walked; Does the speed of sound change with temperature?

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