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TIL those concrete dividers on highways and streets are called Jersey barriers. Originally invented in the 1950s for use in New Jersey, they were first poured in place but are now pre-made and modular or even plastic. Taller varieties are used as defenses outside US military bases.

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wBGP TIL that the world’s oldest company is Kongō Gumi, a Japanese construction firm founded in 578 and which operated independently until it was bought out in 2006.
KYN0J TIL that Ed McCabe—the youngest copywriter inducted into the One Club Creative Hall of Fame—was responsible for some the world’s most successful advertising campaigns that ran between the late 60s-80s. He had no formal training in advertising, and he never graduated high school.
4kdJb TIL There is a rare deer species discovered by and named after Theodore Roosevelt's sons
WgNL TIL that PT Barnum, frustrated with how long people lingered in his museum’s exhibits, posted large signs throughout that said “This Way to the Egress”. He knew most of the visitors would follow them, not knowing that “Egress” meant “exit”. They couldn’t re-enter without paying the entry fee again.
R7NN6 TIL Congressman Leo Ryan is the only US member of Congress to ever be killed in the line of duty. He was assasinated while investigating the Jonestown cult.