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TIL television broadcasters sped up tapes of I Love Lucy reruns in the 1970s while using a special hardware effects unit to alter the actors' voices to their normal pitch. This effectively made more space (around 3 minutes) to run advertisements, generating more revenue for the stations.

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X0GQ8 TIL about the iridium anomaly, an unusual abundance of iridium in the Earth's rock layers which are 66 million years old. This suggest that the extinction event which wiped out the dinosaurs was caused by a meteorite impact, as iridium is much more abundant in meteorites than it is on Earth.
ZLBR TIL 3M company name stands for “Minnesota Mining and Manufacturing Company” = 3M
kO7l4 TIL about Lunar lava tubes - Tunnels under the surface of the moon, kilometers long, hundreds of meters wide. Shelter from radiation and extreme temperatures. Can be used for habitation.
LkvV9 TIL - only three women have appeared on UK Bank Notes (excluding the Queen) - Florence Nightingale £10.00 (1975), Elizabeth Fry £5.00 (2002) & Jane Austen £10.00 (2017). Twleve men have appeared by contrast.
Oom4e Til:The Ringelmann effect is the tendency for individual members of a group to become increasingly less productive as the size of their group increases. As more people are involved in a task, their average performance decreases, each participant tending to feel that their own effort is not critical.