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TIL the dopamine spike in one's brain is there in anticipation of the reward not during the reward itself. Additionally, a 50% chance of getting the reward had the highest dopamine response compared to 75%, 25% or 100% in this order.

vpGR TIL that a Hindu fakir claimed on live television that he could kill anybody with tantric chanting. A man in the audience took him up on it right then and there. The rest of the channels programs that evening were all cancelled to allow give the fakir several hours to attempt the kill.
E1xAV TIL the lion roar sound effects used in The Lion King are not actual lions, but voice actor Frank Welker growling and screaming into a metal trash can.
Zpv0o TIL that scientists used a dating method to show a Viking ax cut trees on the North American continent exactly 1000 years ago, in 1021 C.E. This dating method uses a spike in solar radiation that left a mark in tree rings around the world. This proves the Vikings arrived before Christopher Columbus.
5YvDD TIL Before Edward I was king of England, he was a prisoner of Simon de Montfort. One day, he asked if he could ride the guards horses and raced them one by one. When he got to the last horse, he rode off to freedom, and all the other horses were too tired to give chase.
awLQJ TIL in Russia the first day of school is called "Knowledge Day" falls on Sept 1st and is a national holiday. Kids and parents celebrate by bringing their kids to school carrying balloons and presents for their teachers, it's especially special for first graders.