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TIL the steel used in the US to make structural beams, plates and reinforcing bars is nearly 100% recycled. Employing 1 metric ton (1000kgs) of recycled steel saves the need for the extraction and use of 1.1 metric tons of iron ore, 630 kilograms of coal, and 55 kilograms of limestone.

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4XdLg TIL in 1984 an 8 year old girl with sickle cell disease developed acute myeloid leukemia. To treat the cancer, the doctors gave her chemo and a stem cell transplant from her sibling. Not only did this cure her cancer, but it cured her SCD too. She remains disease free nearly three decades later.
1YyD TIL that there’s a cult in the small island nation of Vanuatu, called that Prince Phillip Movement, that believes that Prince Phillip is a divine being. He once sent a signed picture of himself to them and they sent him a pig killing club.
58Dp TIL Fairmont hotel chain has resident dogs known as Canine Ambassadors, who greet guests in the lobby, accompany them on walks and to make them feel at home.
LAJP TIL that more than four billion years ago Earth was hit by several objects larger than 600 miles that could vaporize the oceans and sterilize the surface yet bacterial life survived deep underground and each time recolonized the planet.
9YEw7 TIL of 'Heaven's Gate' (religious group), who had participated in a mass suicide of 39 of its members (a coordinated series of ritual suicides) in order to reach what they believed was an extraterrestrial spacecraft following Comet Hale–Bopp in 1997.