› added 8 years ago

147

TIL Sunscreen SPF is a very nonlinear metric. An SPF of 15 blocks 93% of incoming radiation, SPF 30 blocks 97%. SPF 50 blocks only 1% more than SPF 30, at 98%.

Read more skincancer.org

via reddit.com

AVKw TIL that in North Korea, since every political candidate is chosen by the ruling party, there is only one name on a ballot. A voter may cross off the candidate’s name to vote against him, but must do so with a red pen next to the ballot box in sight of electoral officials.
wpZo TIL the Church of Scientology ran several smear campaigns against author Paulette Cooper, one of their critics, including Operation Freakout, the goal of which was to have her admitted to a mental institution. Another, Operation Dynamite, used Cooper’s fingerprints to send bomb threats to the Church
OoapX TIL In 1983 a boy named Dave was doused in kerosine and set on fire by his father burning 90% of his body. Shortly after, Michael Jackson heard about the story, met, befriended and supported Dave throughout his whole life.
OGBVg TIL Yuma, Arizona is known as the sunniest city on earth. They have more than 4000 sunlight hours a year, meaning at least 90% of their year consists of sunny days.
GAD7Q TIL Raccoons can make more than 200 different sounds