A tree-like form arises out of numerical connections in a famous maths puzzle known as the Collatz conjecture Marzio De Biasi/Algoritmarte Almost a century ago, a mathematician came up with a puzzle that was so seemingly simple and yet so…

new video loaded: How Ebola Spreads Through Gold Mining Our chief Africa correspondent, Declan Walsh, reports from the epicenter of the Ebola outbreak on how the gold mining industry and the outbreak are linked. By Declan Walsh, Estelle Caswell, Coleman…

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