› added 3 years ago

77

TIL In the 1890s, electric bicycles were documented within various U.S. patents. However, in 1992 hardly any commercial electric bicycles were available and the terms E-Bike, power bike, pedelec, assisted bicycle, and power-assisted bicycle only became popular by 2001

Read more optibike.com

via reddit.com

YQmG TIL there are no natural White Siberian tigers. All known cases can be traced back to humans breeding them in captivity.
DwVJ TIL Anthony Johnson, was the first slave owner in the United States. He was also Angolan (Black).
Xl58 TIL the Great Famine of Ireland caused so many deaths, that Ireland’s population still has not recovered (even after 150 years)
eAr5 TIL that Michelangelo actually intended his famous David statue to be viewed from what we consider to be the side. It presents David as a much more menacing figure, facing down Goliath. Part of the genius of the sculpture is that viewing it from the side suddenly lets you see him as a gentler figure
R7R9w Let’s say you’re doing 100 mph in a car and suddenly a downed tree, stopped the car, or person appears in the road up ahead and you need to slam on the brakes. How much more dangerous is that situation than when you’re doing 70 mph? Your intuition might tell you that 100 mph is only 30% more than 70 mph. But as this video shows, the important factor in stopping a car (or what happens to the car when it collides with something else) does not speed but energy, which increases at the square of speed. In other words, going from 70 mph to 100 mph more than doubles your energy…and going from 55 to 100 more than triples it.