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This is Scientific Americans' 60-second science. I'm Steve Merski.

By now you may have heard about a study that came out a couple of weeks ago about spiders.

The study got a lot of attention because coverage of the research often focused on the idea

that spiders could eat every single person on the planet in a year and still find room for a lot of cows and elephants

and such. In other words, spiders need a lot of meat. Fortunately, the food of choice for the

overwhelming majority of spiders is other arthropods, mostly insects and another type of

tiny critter called springtails. Anyway, the study, which never

mentions spiders eating all the world's people, was done by Martin Nyfeler at the University

of Basel and Switzerland, and Klaus Berkhofer of Lund University and Germany's Brandenburg

University of Technology, places with plenty of spiders, because most places are places with plenty of spiders.

The write-up in the April issue of the journal The Science of Nature concluded that the

world's spider population weighs some 25 million tons.

Your average spider only weighs an itty bit, so if you do the calculation, you get a total

worldwide population of some 11ty gazillion spiders, more or less. But the 25 million tons of

spiders is a real number derived from other published studies dating as far back as 1951.

The researchers then estimated how much weight in food that much weight of spiders

would need, and they also went through many other studies that had estimated how much spiders

...