In first, Scientific American magazine endorses Biden

For the first time in its 175-year history, US magazine Scientific American has endorsed a White House candidate, saying Tuesday it wanted Democrat Joe Biden to prevail because President Donald Trump "rejects" science.

Tornadoes tear though Tennessee, 25 dead

Tornadoes ripped through Tennessee early Tuesday, leaving at least 25 people dead, destroying buildings and toppling power lines hours before the southern US state voted in Super Tuesday primaries.

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