The true price of smartphones
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You've probably never heard of the island of Bangka, but you might have a tiny piece of it in your pocket. In this edition, we take you to Indonesia, where thousands of men and boys risk their lives digging for tin to satisfy our growing appetite for the latest electronic gadgets. Plus, in Test 24, we try the sleep companion by Holi, a light bulb that acts on your body's natural production of melatonin.