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TIL about Cristina Zenato, a professional diver in the Bahamas, who is known as the "Shark Whisperer", who likes to nuzzle sharks as if they were dogs or cats. She has so far removed over 300 hooks from sharks' mouths

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kOX5g TIL that the first nuclear explosion almost occurred by accident in Oak Ridge, Tennessee. Dr. Richard Feynman, a physicist who was working on the Manhattan Project, discovered that the military's "need to know" security resulted in a dangerous amount of uranium nitrate being stored with uranium-235.
B9Dx TIL pistol silencers aren’t too silent. They certainly sound nothing like they do in nearly every movie that uses one.
YMBW TIL that patients who are informed what drug they are going to be trialling, and are then placed on a placebo, can experience adverse reactions as well as positive outcomes. They can also become addicted to placebo medication.
rNEpd TIL 1978, when Atari's then-corporate parent, Warner Communications,refused to open additional locations, they sold the rights of Chuck E. Cheese to Atari Co-founder, Nolan Bushnell for $500,000. He was later joined by Atari's other Co-Founder, Gene Landrum, who came onboard as their CEO.
graW4 TIL one estimate claims that Earth may have 1 trillion species. However, only 1.75–1.8 million have been named and 1.8 million documented in a central database. These currently living species represent less than one per cent of all species that have ever lived on Earth.