› added 10 years ago

151

TIL Most alarms and sirens fall into the frequency range 1-3 kHz where the human hearing is the most sensitive, but this frequency range is also a black spot in our sound location abilities.

Read more physics.org

via reddit.com

XZ98 TIL George Washington’s Presidential salary was $25,000 ($ 1 million today) and spent 7% of his income on alcohol
Gv04 TIL that not swinging your arms when you walk increases the effort of walking by 12%, the equivalent of walking 20% faster or carrying a 10 kg backpack.
KO0g4 TIL one of the reasons why the girls that took the Cottingley Fairies photos did not originally state they were fake was because Sir Arthur Conan Doyle believed them to be real, and they did not wish to embarrass him. To the day they died, both girls insisted they had really seen fairies.
W7N4N TIL that Mao’s last wife, Jiang Qing (also know as Madame Mao) last words in her suicide note was, “Chairman, your student and fighter is coming to see you!"
eBv5 TIL that Seth MacFarlane spoke to Neil DeGrasse Tyson to make sure he got the night sky right in Ted