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TIL that the Greenland shark is deemed biologically immortal. With the estimated life span of up to a 500 years, reaching sexual maturity at around 150 years of age, the Greenland shark is the longest living vertebrate on the planet. Not a single specimen has been observed dying from old age.

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kJGR1 TIL researchers are able to study atmospheric composition, stretching back thousands of years, by examining air bubbles trapped in ice
LkGE0 TIL that about 44% of deaths among Russian soldiers are due to suicide after being a victim of a systematic abuse called Dedovshchina
loGY5 TIL that Liechtenstein & Uzbekistan are the only two double landlocked countries in the world. A country is "doubly landlocked" or "double-landlocked" when it is surrounded only by landlocked countries (requiring the crossing of at least two national borders to reach a coastline)
ZpYQv TIL that between the 9th and 12th centuries Dublin was a major centre for slave trading by the Vikings. Slaves were taken from places such as Ireland, Scotland, England and Spain. They were sold as far away as Iceland and Anatolia.
neW TIL that the Body Mass Index (BMI) was created for a social statistics experiment, and was never intended to be an indicator of health.