Why does puberty trigger us to stop growing?

All animals start out as a single-celled organism and then start growing. At some point, of course, they need to stop getting bigger, but the process by which this happens is poorly understood.

WWF urges end to deadlock on new Antarctic reserves

Members of a multinational group on Antarctic conservation must end a years-long deadlock and agree on new marine reserves in the region as sea-ice shrinks to record lows, the WWF urged Wednesday.

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