First theorized by Einstein 100 years ago, gravitational waves are predicted ripples in space-time caused by massive events or objects in the universe. But no detection has ever been made, as the ripples are incredibly tiny and almost impossible to detect.
Along with just about every other aspect of real or imagined differences between the sexes, the idea that your biological sex will determine the sex of your brain – and so your behaviour, aptitudes and personality – has a long and controversial history. The idea that a man’s brain is “male” and a woman’s brain “female” is rarely challenged.
Technological improvements mean that the phones, tablets, computers and other electric devices we find so essential are cheaper and more powerful than ever. But this means we upgrade them sooner and they quickly become unwanted or obsolete, and are thrown away. The huge amounts of waste electrical and electronic equipment – WEEE, or e-waste – that results is quickly becoming a major worldwide environmental, economic and health problem.