Menopause May Be the Evolutionary Origin of Romantic Relationships -- And Cheating

Menopause is one of the oddest features of human reproductive biology. Not the hot flashes or the forgetfulness, but the fact that older women lose the ability to have babies. Now researchers say that once it appeared, menopause may have had a ripple effect on human mating that helped create the human pair-bond. »9/08/15 6:20pm9/08/15 6:20pm

Good Lord, Scientists Have Discovered Skydiving Spiders in the Jungles of South America

As if arachnophobes didn’t already have enough to worry about, biologists working in Panama and Peru have discovered a nocturnal hunting spider capable of steering while in free fall—an unprecedented adaptation in tree-dwelling spiders that’s offering fresh insights into the evolution of flight. »8/19/15 1:40pm8/19/15 1:40pm

Why Do Cicadas Emerge at Prime Intervals of 13 and 17 Years?

Mathematicians are fond of prime numbers. Infinitely numerous yet utterly unique, they play an integral role in number theory and a baffling one in such longstanding mysteries as Goldbach’s conjecture. Nature is partial to primes, as well, as demonstrated by the dramatic 13- and 17-year life cycles of periodic cicadas. »7/22/15 5:32pm7/22/15 5:32pm

Australia's Most Infamous Invasive Species Has a Problem with Breeding

Cane toads were first released in Australia in 1935 as part of a government program to control the insects attacking the Queensland cane crop. It didn’t work. Ever since, the toads have been spreading across the country, as fast as they can breed. Which would be even faster, if it weren’t for an odd quirk in their… »7/14/15 7:15pm7/14/15 7:15pm

The Biggest Kangaroos Evolved Long Arms to Fight Over Females

Male kangaroos and wallabies, like a lot of seemingly quiet grazing animals, get into knock-down drag-out fights over females. They obviously don’t have antlers or horns to spar with, but they’re perfectly willing to grapple rivals with their forelimbs and kick the crap out of each other with their big hind feet. »7/01/15 9:00pm7/01/15 9:00pm