TIL In 2019 a Japanese University student studying ninja history turned in an essay written in invisible ink. The words only became visible when the paper was heated over a gas stove. Her professor without even revealing the whole essay gave her an A.

[u/Ill_Definition8074]

https://www.bbc.com/news/world-asia-49996166

[u/TheGoldPowerRanger]

Hi, Wayne! 🚲 🚗

[u/Whitecamry → u/TheGoldPowerRanger]

Good night, John-Boy.