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TIL The Lockheed SR-71 Blackbird used an Astro-inertial Navigation System to track Stars and determine its position and altitude. At Mach 3, the navigation system was accurate enough to limit drift to 1,000 feet (300 meters) off course.

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gNXW TIL of Deborah Nadoolman, who was a film and theatre costume designer, responsible for the Indiana Jones’ fedora, as well as Michael Jackson’s red and black ‘Thriller’ jacket.
GY8dQ TIL- apples are not indigenous to North America, nor most of Europe. They originated in Kazakhstan, in central Asia east of the Caspian Sea. The capital of Kazakhstan, Alma Ata, means “full of apples.” By 1500 BC apple seeds had been carried throughout Europe
j6N9p TIL Tucson is the longest continuously inhabited region in the US stretching back for at least 4,000 years
kgkg TIL of Tanya Savicheva, a young Russian girl who kept a diary through the siege of Leningrad. The last entry is “All Savichevs died. Now remains only Tanya.” Tanya later died as well.
7dBx TIL that fans reacted badly to Arthur Conan Doyle killing off Sherlock Holmes. It was front-page news around the world; 20,000 people cancelled subscriptions to ‘Strand’ magazine and sent hate mail; thousands wrote to the author begging him to undo the death. Doyle resurrected Holmes a decade later.