Share Radio's technology editor Steve Caplin explains how the Japanese believe they can turn food scraps into a building material stronger than concrete. Also Amazon Sidewalk and meditation boxes for their warehouse employees, how potatoes can be made to fluoresce to show if they're stressed, the British tanks that cost £3.5 billion that are almost completely useless, smart sunglasses, a 25-inch e-ink monitor and why the world's deepest pool is to be built in Cornwall.
