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TIL-Planned systemic obsolescence is deliberately making a product obsolete by altering the system in which it is used as to make its continued use difficult such as not accommodating forward compatibility in software, or changing screws so that they cannot easily be operated on with existing tools.

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Nk46 TIL Habitual mouthbreathing can cause crowding of the teeth and drastically change the shape of your face.
VBkYG TIL the U.S Army once designed an anti armor grenade that would be the same size and shape of a football so US soldiers knew how to sling it and the prototype was built using a hollowed out nerf ball.
Oogb6 TIL that the archaic study of head shape (Phrenology) is responsible for many sayings. Intelligent people had a "highbrow", stupid people had a "lowbrow", people with balanced attributes' heads were "well-rounded" and psychiatrists would reduce areas of people's brains and were called "shrinks".
V7eZ TIL Sir Hugh Beaver, of the Guinness Breweries, got into an argument over which was the fastest game bird in Europe. There was no book in the world with which to settle arguments about records and questions debated nightly in pubs throughout Ireland. Guinness World Records was born.
Dn0e Today I learned that in 1680, the time of the Puritans, an X-rated sex manual was sold in mainstream bookstores called “This Misterie of Fucking.” It promoted premarital sex and masturbation and contained crude etchings of different positions.