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TIL in the 70’s the CIA had developed a working nearly traceless heart attack gun. It has contributed to many alleged assassinations and has been subject of many whistleblowers, including Matt Simmons who was exposing BP’s lies.

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x6j8g TIL the deepest fish ever recorded was found at a depth of 8,336 meters, more than twice the depth of the Titanic.
AG1a TIL: If you cut off a Starfish’s leg it will grow back. The leg itself will also grow a new body containing four new legs effectively cloning itself.
jN6KR You probably know that your visual perception of the world is a bit different than your pets’. Dogs see things with less color than humans, snakes can see infrared, and if you have a pet bull, it lives in a world where red and green are the same color. This brings up a good question. Why do you have a pet bull? You should get a cat instead, and when you do, it is important to know that your new friend can’t focus on objects farther than 20 feet away. The point is, animals have evolved to see in a variety of ways. But how can we see things through their eyes? Marine biologist and National Geographic Emerging Explorer David Gruber collaborated with a research team to develop lights and camera filters that allowed him to do just that, underwater. Through their work, the team discovered biofluorescence in an abundance of aquatic species. This “glowing” trait has to do with how an organism absorbs and emits light. Research has indicated that this radiance is possibly used for communication and camouflage. One caveat: You need a certain species of eyes (or David’s camera) to see it. Swell sharks (Cephaloscyllium ventriosum) have fluorescent proteins inside their skin, which are triggered by the ocean’s blue light, becoming visible to other swell sharks. David’s camera has special yellow filters that allow the simulation of a swell shark’s vision. It turns out there is a massive rave going on 500 meters below the ocean’s surface, and one of the glowing guests is a type of cat shark!
pY09Q TIL about primordial black holes (PBHs), hypothesized to have formed in the early universe; some small extra-dense spots collapsed into black holes as everything expanded and cooled down. It's also been hypothesized that dark matter, which constitutes 85% of the universe's mass, is made up of PBHs.
rRp5w TIL through the last 90 years of American history there have been only two decades with the GDP increasing every year - the 1960s and the 2010s.