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TIL that the A and B rings of Saturn (the most visually prominent rings) are hundreds of thousands of kilometers wide, but only 5-15 and 10-30 meters thick, respectively.

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P1kkL TIL the McLaren F1 is so valuable now, that it is essentially impossible for one to be "written off" by an insurance company, since the repair costs will always be less than the value of the car. Furthermore, McLaren will fully repair a crashed F1, no matter how substantial the damage.
Ej0o TIL hand grenades got their name from the French word for pomegranate
lo5mN TIL that British Prime Minister Gordon Brown was forced to apologize to the mother of a dead serviceman in 2009 after he sent her a handwritten letter of condolence that misspelled her name. The Sun tabloid then attacked Brown for making the mistake, & in doing so managed to make the same mistake.
4XAo6 TIL Werner Forssmann, a physician, risked his own life to show that cardiac catheterization could work. He cut a hole in his arm and inserted a catheter into a vein, not knowing if the catheter might pierce a vein. He was later awarded the Nobel Prize in Medicine.
VMbM0 TIL (initially from my textbook) that the Cheaper by the Dozen family was inspired by the Gilbreths. The mother Lilian (a psychologist), and the father Frank (an engineer) were famous for many other things besides the book one of their daughters wrote about the family.