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How prairie dogs use the Bernoulli’s principle.
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How prairie dogs use the Bernoulli’s principle.
In order to ensure sufficient oxygen within their burrow, one of the entrances is built with a raised mound of dirt, while the other is not. This determines different wind velocities and different pressures + natural ventilation
有趣
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twitter.com)
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Massimo
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"This was filmed last Wednesday afternoon at Riverside Veterinary Clinic in Indianapolis, Indiana. The officer is Sergeant Paul Greer. He's 41 years old. Fourteen-year veteran of the Indianapolis Metropolitan Police Department. The dog is Bruno. A ten-year-old German Shepherd who
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"This was filmed last Wednesday afternoon at Riverside Veterinary Clinic in Indianapolis, Indiana. The officer is Sergeant Paul Greer. He's 41 years old. Fourteen-year veteran of the Indianapolis Metropolitan Police Department. The dog is Bruno. A ten-year-old German Shepherd who
时政
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twitter.com)
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Building mega-projects is the easy part.
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Building mega-projects is the easy part.
Maintaining them is where empires crumble.
So why do some countries pour billions into glittering skyscrapers, high-speed rails, and vanity stadiums… while their own citizens lack clean water, basic healthcare, or safe roads?
Because
时政
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twitter.com)
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Megyn Kelly: Elon Musk is the greatest free speech warrior in the modern world.
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Megyn Kelly: Elon Musk is the greatest free speech warrior in the modern world.
“Elon Musk has been so important to expanding the national debate. I know he takes a beating by some on the left because he sends out strange tweets sometimes, and so who cares?
This guy is the
btc
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twitter.com)
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