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TIL: Whistling to cat call a woman is just the whistle to recall your dog - but in reverse

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nJg7 TIL huge amounts of renewable energy can be stored over a long period of time by using Pumped Storage Hydropower, where water is pumped up a hill with renewable electricity then sent back down the hill to generate on demand clean electricity at up to 80% efficiency.
QJ9yE TIL Research shows that cats that are provided with empty boxes were more interactive, friendly and comfortable with the people around them as compared to those cats that did not have a box to snuggle in. So, it can be said that cats derive comfort and security from boxes.
nW4xG TIL one species of redwood tree is deciduous (Loses its leaves and changes color). The Dawn Redwood was thought to be extinct for millions of years and is an endangered species.
M7Lp8 TIL that Spock from Star Trek was almost cut from the show. NBC feared that the Vulcan "looked like the devil and might offend religionists in the audience."
OGApe TIL there is an immortal species of jellyfish