So what goes on a page about "cool stuff"? Some of my favorite things, like ...
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Gadgets controlled by your thoughts ... and, no, I'm not talking about a magic trick or the latest sci fi thriller. The technical name is brain-computer interface (BCI). It's where our minds, using only the assistance of a computer, power all sorts of things by thought alone: robots, cars, artificial limbs ... and maybe each other? Yes, some scientists have even extended the technology to brain-brain interface (BBI). Read about it here.
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Sea jellies, definitely. I think they're cool (so I take lots of pictures of them). Find out why they're so fascinating. I've written a little about them here.