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TIL of the Jack Hills, a range of hills in Mid West Western Australia. They are best known as the source of the oldest material of terrestrial origin found to date: zircons that formed around 4.4 billion years ago

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jN78j TIL the "drying" of oil paint is not due to evaporation of water or other solvents, but instead to atmospheric oxygen forming crosslinks between oil molecules, polymerizing them into a solid.
mLpY TIL of Iqbal Masih (1983-1995), a Pakistani child who, at age four, was sold into bondage by his family, escaped after years of hardship and helped thousands of children flee bondage labor through his internatioal activism. He was assasinated at age 12.
kOvE7 TIL of 'Kodokushi' or lonely death : A Japanese phenomenon of people dying and remaining undiscovered for a long period of time.
07oj TIL that during WW II the 603rd unit was designated as Camouflage Engineers. Many of the soldiers were recruited from arts schools and set designers. Their objective was not only to teach camouflage, but to deceive the enemy through the art of design. They became known as the Ghost Army
BgZ0x TIL the Ancient Olympics were held at least 293 times (1,169 years) consecutively — from 776 BC to 393 AD — nearly 10 times longer than the Modern Olympics have been running (since 1896).