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TIL Carl Sagan has a number named after him. Sagan’s number is approximately 300 sextellion and refers to the number of stars in the universe.

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Je0v TIL that Theodore and Eleanor Roosevelt, when staying in the White House, reported sightings or a presence of Abraham Lincoln’s Ghost. Sightings have also been reported by Margaret Truman, Winston Churchill, and Henry Truman.
GY95j TIL Theodore Roosevelt as a child, watched Lincoln’s funeral procession pass by his house. His admiration for Abe was reinforced later in life when he met John Hay, who was Abe’s secretary. Hay gifted a ring that contained Lincoln’s hair to Teddy. Teddy then wore the ring on his inauguration day.
xVa47 TIL of the Prince Rupert's Drop, created by dripping molten glass into cold water. Capable of shattering bullets on impact and withstanding the blow of a hammer, this "glass droplet" is characterized by its incredibly high residual stress.
N7Nr1 Today I Learned about Native American Trail Trees, which served as trail markers for important sites. This was done by bending saplings in 90 degree angles. As the tree continues to grow it retained this “N” shape. Thus permanently marking the trail.
ZvWB TIL that a woman who died in 2009 had at least 1400 descendants (11 children, 150 grandchildren, 1000 great-grandchildren, great-great-grandchildren)