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TIL Scientists hack a computer using just the sound of the CPU. Researchers extract 4096-bit RSA decryption keys from laptop computers in under an hour using a mobile phone placed next to the computer.

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ojQ8 TIL of the Encyclopedia of Ethical Failure, the government’s official collection of hilarious and unethical abuses of resources by employees (direct link in comments)
rRK8o TIL lime juice on skin, when exposed to sunlight, can cause a poison ivy type rash called phytophotodermatitis. It is common for bartenders making margaritas but can also be a problem for basic skincare products like deodorants and lotions that use real lime.
W7G49 TIL that orcas spend their entire lives with their mothers. Only one whale is known to have survived alone: Luna (or Tsux'iit) was young when separated and ended up in Nootka Sound. He was adored by locals for his interactive and playful demeanor, seeking socialization intensely without his pod.
6EQw8 TIL that the wrath of the Mongolians was so feared that, according to tales, a lone Mongolian soldier could walk into a village and kill its inhabitants to his heart's content without anyone trying to resist him.
OoG96 TIL Count von Count of "Sesame Street" laughed maniacally and used hypnotic stunning powers in the early 1970s, but they softened his act to not scare kids. He still annoys other puppets by interrupting their business to feed his counting addiction. He usually comes on TV at 2:30 PM ("Tooth Hurty").