"TIL it took around 3 billion years for the very first single-celled organisms to eventually evolve into basic animal life forms. For comparison, dinosaurs were around for about 165 million years, modern humans have been around for 300,000 years."

"TIL the US Navy has a 'Fleet Admiral' rank which only four people have ever achieved. It includes the unique benefit of active duty pay for life."

"TIL in 1981 Chicago mayor Jane Byrne moved into the crime ridden Cabrini–Green public housing project in an attempt to improve its reputation. Despite having bodyguards she left just a few weeks later, furthering the public perception of Cabrini–Green as the "worst of the worst" in the city."

"TIL Throughout much of the 20th century, a majority of states once required a blood test (mostly for STIs) before issuing a couple a marriage license."

"TIL Some flying insects have biologic versions of gyroscopes. The haltere is a small bell like structure that vibrates and can account for changes in rotation using the Coriolis effect, so the insect knows its position and can make corrections."