Sea lion colony in Mexico defies declining numbers

The population of California sea lions is down dramatically due to climate change, but in one natural refuge area off the coast of northwest Mexico, they are doing well and delighting tourists who dare to swim with them.

Dam strength determined by balanced rocks

Balanced rocks, poised in position for 24,000 years, have been used to assess the current seismic integrity of the Clyde Dam in a University of Otago-led study.

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