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The discovery that monkeys' version of the TRIM5 alpha protein makes them remarkably resistant to HIV could pave the way for the prevention and treatment of HIV in humans. Testing a theoretical link between modern HIV-resistance in some Europeans and the Black Death, 700 years ago. The sonic trap humpback whales lay for fish in their "bubble nets". What the Hubble space telescope could tell us about dark energy. Although many languages face extinction, linguistic diversity will be maintained through social changes.