I just read that modern toilet paper was invented in 1857. However, it wasn't until the 1930s that "Splinter-Free" paper was developed. Until then the manufacturing process often included wood splinters in the paper. So I've just discovered my personal cut-off for time travel.
Japanese engineers developed a “Sword Tip Visualization System” for the Fencing World Championships, and it makes fencing look absolutely incredible to watch.
Hope everyone is doing awesome!! Came online to say I’m watching The Martian and that move remains flawless. I love it so much. Incredibly rewatchable. Also awesome cast!