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TIL in 1992, a retiree was out searching for a lost hammer with a metal detector. During his search he found a huge cache of Roman treasure, including 15,234 coins. The British government gave him and the owner of the land £1.75 million for finding it. Later on, he also found the hammer

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mmWO TIL we possess all of the technology necessary for “vactrains” capable of speeds of 4000+ mph
XEdE TIL that 10 years ago an eight-year-old boy had his arm bitten off by a shark. His uncle got mad and grabbed the 7-foot-long shark and dragged it to shore. The shark was killed, the arm removed from it’s stomach, and reattached to the boy, who made a full recovery.
0de7j TIL that despite there being a number of empirically based theories, we still aren't completely certain of the origin of Earth's water.
W79kL TIL that NBC had another sitcom in the works at the same time as Seinfeld also named for its main actor called Ann Jillian that scored better with test audiences than Seinfeld's pilot episode and NBC executives gave a full season order. It was canceled after just one season.
j6J9n TIL in 1971 a Time Dilation experiment had 2 flights w/atomic clocks go around the world to prove Einstein's theories of relativity (time moves slower as you approach the speed of light, and/or when exposed to more gravity). The clocks gained 0.15 microseconds compared to the ground based clock.