What it time? Is it the uniform, steady flow envisaged by Newton that helps us follow our daily routines? A spooky, purely subjective feeling? A dimension of Einstein's space-time? Or simply the phenomenon that stops everything from happening all at once?
Science writer Dan Falk is on hand to discuss the neuroscience, the physics and the philosophy of chronology and poses the question - do we really know what time is?
James Randerson and Nell Boase join Alok for a round-up of the week's science news including claims that vegetarians are 45% less likely to develop cancer of the blood compared with meat eaters, a monster haul of new dinosaur species discovered in the Australian outback, and the G8 nations' battle with climate change.
We also visit the Royal Society's Summer Exhibition to sink our teeth into some of the latest creations of science. Among the exhibits were a virtual cow, lasers that can treat cancer – and a very excitable and science-literate bunch of schoolchildren.
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