The next time you spot a spider and are headed for it with a shoe, ask yourself if you really want to be squishing a critter that could theoretically band together with all of its arachnid brethren and wipe out the entire human race in a single year.
No, this isn't a scene from Tarantula — it's a new study published in Science of Nature, which found that the world's spiders consume between 400 million and 800 million tons of prey every year. The total adult human biomass on Earth is estimated to be 278 million tons. You do the math.
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