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TIL through years of natural selection due to epidemics in Europe, a percentage of people of European decent carry the gene CCR5. Of that population, some have a CCR5-32 Delta mutation which makes them immune to HIV.

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OGPoe TIL researchers have found that the ancient Romans manipulated chemistry to make "quicklime" that caused "self healing" concrete, thereby preserving ancient Roman architecture, and answering why so many of their structures remain standing when modern structures fail.
mxgpy TIL a single worksheet on Microsoft Excel contains 16,384 rows and 1,048,576 columns, for a total of 17,179,869,184 cells.
K1XR TIL that there is a kind of tumor that can develop tissues and functional organs, like eyes, torso, hands, teeth and feet.
jNjKE TIL Draco was the first legislator in Ancient Greece. He replaced the system of oral law and blood-feud with written codes to be enforced by courts. Citizens were unaware of the harshness of his laws, giving rise to the term Draconian.
bA0j TIL alpha/beta wolves don’t exist in the wild, a misconception due to observing those raised in captivity