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TIL Files kept secret for 60 years indicate British intelligence may have knowingly sent more than 50 of its own agents to almost certain death in occupied Holland during the Second World War as part of a complicated "double double agent" game played against the Germans.

Read more telegraph.co.uk

via reddit.com

4X7QJ TIL Dr. Charles R. Drew, an African American, developed improved techniques for blood storage, which saved thousands of Allied forces' lives during WWII. In 1942, however, he resigned as director of the first American Red Cross Blood Bank because of their exclusion of African-Americans' blood.
GAJXJ TIL That the theoretical black dwarf star is expected to be able to live for up to 10 to the power of 32000 years, meaning that when they go supernova may make it the last transient to occur before the heat death of the universe.
noVY TIL that UC Davis researchers devised a test for bomb and drug-sniffing dogs. They put dogs through 144 runs of a clean room with no drugs or explosives. But the dogs indicated on 123 runs, indicating a failure rate of 85% according to the test’s criteria.
OyaX TIL There was a “Back to the Future” animated series that ran from 1991-1992. The show was not popular, but it featured live-action segments where Christopher Lloyd would teach viewers how to do an experiment, and Bill Nye was his assistant. The segment ultimately led to “Bill Nye the Science Guy”.
a8k1Z TIL there was an 1906 Olympic Games hosted in Athens, Greece but the IOC have taken away the status of 'Olympics' to the games