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TIL that the tumbleweed originally came from Russia

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R5BlQ TIL Lockheed Martin once planned a 6000 tonne nuclear powered aircraft transport which would carry and deploy fighter jets.
b6roZ TIL Uranus had been observed and catalogued multiple times going as far back as 128 BCE. However, due to its very slow orbit and dimness it was always misclassified as a star until 1781. The discovery that it was actually a planet effectively doubled the size of the known solar system.
nelBd TIL the USA spent 2 years building a fort to protect from Canadian invasion, but it was accidentally built in Canada. They abandoned construction and called it Fort Blunder.
XEKBR TIL After an Australian radio host used his influence to demand advertisements be shown on the Sydney Opera House, a comedy group projected "Advertise Here" on the landmark followed by the radio host's home phone number, causing him to apologize on air after he was flooded with calls
x6r1g TIL A phenomenon called "change blindness": An experiment found that nearly half of people failed to notice when the person they were talking to was replaced with someone else after a brief visual distraction.