› added 1 year ago

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TIL that the radioactive noble gas, Radon, is present in the soil and in the water. While flowing upward, it accumulates in our homes, since they trap it inside. It is estimated to cause 21000 death annually.

Read more ncbi.nlm.nih.gov

via reddit.com

gMQNL TIL precolonial Mesoamerican maps depicted both geographic features AND its history using logographs showing what an area was (i.e. a hill) and what happened there (i.e. glyphs for battles etc). As it told their stories, Native city-states used their city-maps as state symbols, akin to modern flags
woKxW TIL That the “57 Varieties” slogan of Heinz ketchup is meaningless; there are not, and never have been “57” of anything Heinz related
j6eNX TIL Hezekiah's Tunnel is a collection of tunnels in the rock beneath Jerusalem. It was built around 700 BCE to prepare for a siege by the Assyrians. Some of them are still used.
bKZN TIL Ren and Stimpy, Doug, and Rugrats all premiered on the same day
neVQ9 TIL that Woody Harrelson's father, Charles Harrelson, assassinated federal judge John H. Wood Jr. in 1979, the first federal judge to be killed in the 20th century. He had also been tried for murder two other times, and convicted for one of them.