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TIL Techniques in astronomy of taking images of the sky are being used by dermatologists to monitor melanoma in high-risk patient who have their full body photographed. A patient’s skin is treated like the background sky in an astronomical image, and any moles are treated as stars

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Z8ZaQ TIL Iceland has a near 100% termination rate in pregnancies where the mother knows the child will be born with Down's Syndrome.
aw1GZ TIL Voting is mandatory in Belgium. Citizens are automatically registered in the electoral polls and more than 90% of the eligible population takes part in the voting process, since you risk a fine if you do not vote either in person or by proxy.
YpZWP TIL that it's illegal to die in Longyearbyen, Svalbard (Norway) because dead bodies weren't decomposing properly because of how far north it is. If someone is dying, every effort will be made to ship them to the mainland.
AD16l TIL while the chloroplasts of nearly all known photosynthetic eukaryotes derive ultimately from the a single cyanobacterium taken in by a eukaryote a billion years ago, there are 3 species of amoeba which had taken on a cyanobacterium more recently and whose endosymbiont is called a chromatophore
KOVXa TIL though distilled water has a pH of 7 immediately after distillation, it becomes slightly acidic with a pH of 5.8 some time after distillation because it absorbs carbon dioxide from the atmosphere.