› added 8 years ago

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TIL: 3 US Presidents died from drinking water contaminated with sewage

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xV9l1 TIL the FBI supplied 48 police agencies with Stingray surveillance hardware that mimics cell phone towers, and had them sign non-disclosure agreements to stop them confirming their use of it or its capabilities to anyone, including courts of law. Cases would be dismissed rather than expose the tech.
X05br TIL Grass Allergy can make you food intolerant to tomatoes when it's grass pollen season
0d4Gp TIL The US Army Intelligence Service states Elvis Presley is a "definite danger to the security of the United States" because he had driven girls and boys mad.
KOG4w TIL: Wilhelm Conrad Röntgen, discoverer of the X-Rays, chose the name himself and didn't want them to be named after him. It is used worldwide with exception to his native Germany where they are call Röntgenstrahlen (Röntgen-Ray)
16KlX TIL that it is possible to reach negative Kelvin in advanced physics: a system's temperature is above 0K if adding energy increases its entropy (disorder of the particles). However, once the entropy is maximum, adding more energy makes it decrease, meaning the system's temperature drops below 0K.