wikipedia.org

D19PP TIL of the tomb of Marcus Vergilius Eurysaces. Eurysaces, a baker, who lived in Rome during the 1st century BC built himself a 33-feet tall tomb, sporting intricate designs and extravagant engravings. Eurysaces, though having died a wealthy man had come to Rome as a slave.
1aDvV TIL of a mathematical formula named Rossmo's formula used to track down the homes of criminals based on where their crime-scenes were
GYwNQ TIL the US military is developing a plane capable of Mach 6 (4,600 mph) to succeed the now-retired SR-71 Blackbird, which flew at Mach 2.8. This new plane, the SR-72, is unmanned, will perform surveillance and reconnaisance, and a protoype will fly in 2025 before entering service in 2030.