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TIL that Killer whales bully, attack and sometimes kill Great White sharks and thus drive them away from certain areas. Scientist are looking into using Killer whales’ sounds in order to drive sharks off and make some coastal areas safer for beachgoers.

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R5Wl1 TIL Emerson Romero was a silent film actor who was deaf. When movies with sound were invented, deaf actors got less roles and the intertitle text was removed. This led him to make an early form of movie captioning in 1947 so that movies would still be accessible to deaf people.
P1n6n TIL Michelle Philpots suffered two traumatic brain injuries in two car crashes and since then (1994) she's been unable to form new memories. Every morning her husband, who she started dating before her injury, has to convince her of their 1997 marriage using a photo album as proof.
D1Zej TIL most polar bears are twins. And while they are the largest land carnivore, newborn cubs are only about 10 inches (25 cm) long, and weigh about 2.2 pounds (1kg). They grow rapidly because the mother's milk is 31% fat.
NXPG1 TIL Theodore Maiman made the first laser operate in 1960 by shining a high-power flash lamp on a ruby rod with silver-coated surfaces. He promptly submitted a short report of the work to the journal Physical Review Letters, but the editors turned it down.
R7Oea TIL that Michael Jackson suffered from severe insomnia and did not get any real sleep for 60 days prior to his death. Instead, his personal doctor had been putting him under general anestheisa every night.