The 20 online talks that could change your life

Tom Meltzer: From TED talks to online seminars, video channels crammed with inspirational and thought-provoking lectures are educating us on everything from town planning and depression to body language, animal morality and dangers of sugar in just a few minutes. Here is our pick of the best

Adding salt to sweet will always be a seller

Emma Sturgess: Concerns about hidden salt levels in biscuits are well founded, but conspicuous consumption in the form of salted caramels has won over fans from Nigella Lawson to Barack Obama

Is plastic food packaging dangerous?

The phthalate chemicals used in packaging are banned in some countries and have been blamed for many ailments. So should you ban them from the house?