This article on Mental Floss summarises a science report that shows that, because of our body mass, for a human to be able to climb walls like an insect our bodies would need to be 40% or so covered in sticky pads.
So, apart from getting bitten by an irradiated spider the effect of which radiates our own blood and results in a variety of physical mutations, it’s not scientifically possible to be Spider-Man.
You can all stop looking for radioactive spiders now.
Read the whole thing at Mental Floss.
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