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TIL that the first animal balloons were made by Aztecs around year 1300, using real animal intestines; stomachs and bladders were also used. The intestines would be cleaned, sealed, filled with air and twisted to make dog and donkey shapes. These balloons were used as a sacrifice for gods.

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j6L6R TIL That most female cheetahs go their entire lives without raising a single cub to maturity. The species is dependent on "supermoms" that are particularly adept at raising cubs. One such supermom, Eleanor, has mothered at least 10% of all adult cheetahs in the southern Serengeti.
obRL TIL Fred Rogers was committed to racial diversity, and not long after inner-city riots erupted following the assassination of Martin Luther King Jr, Rogers introduced the character of a black police officer keeping everyone safe in the neighborhood.
v1ZRR TIL Bindi Irwin had her $350,000 Dancing with the Stars prize money withheld because a Los Angeles Superior Court judge was requiring Irwin produce a form signed off by her father Steve. Steve Irwin had been dead for almost a decade.
yQZBe TIL No Bra Day was spun off a medical event to encourage breast cancer survivors to consider reconstructive surgery. It was named BRA (Breast Reconstruction Awareness) Day. Some see it as sexualizing and exploiting women's bodies while at the same time belittling a serious disease.
67gw TIL there was a fire in a school in Collinwood, Ohio that resulted in the death of 172 students, two teachers and a rescuer, making it the deadliest school fire in the United States.