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TIL about a batman, an individual assigned to a commissioned military officer as a personal servant. An officer's batman was also responsible for the officer's "bat-horse" that carried his kit during campaigns before cars were invented. The term also predates the superhero Batman's appearance.

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JYwMk TIL the idiom "Turning a blind eye" is attributed to Admiral Horatio Nelson who, in the midst of battle and given the permission to retreat by his superior, lifted the telescope to his eye (blinded from an earlier injury) and said "I really do not see the signal" and pressed on with the attack.
XEnO8 TIL that US started a major effort to count arrest-related deaths between 2003-2011 employing a specialized team of statisticians with US Bureau of Justice Statistics. The program had to be terminated due to poor participation from the states and lack of funding.
Xlxj TIL Learned helplessness is a condition in which a person suffers from a sense of powerlessness, arising from a traumatic event or persistent failure to succeed. It is thought to be one of the underlying causes of depression.
VM5j4 TIL that Sister Mary Kenneth Keller was the first woman to get a Ph.D in computer science.
yQNGX TIL that during World War II, Disney made animated films for every branch of the U.S. military and government. 90% of Disney employees were devoted to producing the animations. One film had Donald Duck in an nightmare were he worked in a Nazi artillery factory, and ate in very small rations.