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TIL when BankAmericard (now known as Visa) became profitable in 1961, Bank of America deliberately kept this information secret and used widespread negative impressions to ward off competition. This worked until 1966, when BankAmericard's profitability became too big to hide.

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XRdD TIL A Canadian who flew a Spitfire in WWII kept his Military history secret for 56 years because a fire destroyed his log books and uniforms.
78kmb TIL when a chicken is exposed to the allergen that makes us allergic to cats, they naturally produce an anti-Fel d1 antibody, known as polyclonal egg IgY antibodies, which they pass along to their eggs.
0dWpN TIL that Student Syndrome refers to planned procrastination, when, for example, a student will only start to apply themselves to an assignment at the last possible moment before its deadline. According to an academic source, this induces a level of urgency high enough to ensure the task is completed
j6KyQ TIL that Queen's "Another One Bites the Dust" was not intended to be released as a single. They were later convinced to do so by Michael Jackson who had attended a Queen concert in Los Angeles and suggested it to Freddie Mercury backstage.
VrJ8 TIL Physics dictate that unless otherwise contained a river will never flow straight for a distance greater than 10 times its width. It has to do with the center flowing faster and the friction induced by the banks.