› added 4 years ago

273

TIL Concrete absorbs carbon dioxide from the air.

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dDAx7 TIL The famous "rods from god" concept of a space-based weapons system of orbiting tungsten rods was developed by science fiction writer Jerry Pournelle.
JY1El TIL: The small bow found inside of many hats is a symbolic memorial to past hatters who had died of mercury poisoning
WXd4 TIL Ireland is the only country in the world with a musical instrument as its symbol
4kO7a TIL: William R. King is the only U.S. Vice President to take the oath of office on foreign soil. King had tuberculosis and had traveled to Cuba to regain his health. Since he couldn't be in DC to take the oath, Congress passed an act that allowed him to be sworn in near Matanzas, Cuba.
j69LX TIL there were vacuum cleaners before electricity was common. They were manually pumped while vacuuming.