More Things Are Dying More Often

Scientists want to know why animal populations crash, and understanding financial markets better might help them do it.

About 1,500 walruses gather on the northwest coast of Alaska in September 2014. Pacific walruses, looking for places to rest in the absence of sea ice, are coming to shore in record numbers, according to the NOAA.

Corey Accardo/NOAA via AP Photo

“Diversify your portfolio” is great advice—and not just for investments. The math that backs it up turns out to explain much more than stock market returns. 

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