› added 6 years ago

550

TIL That in the Live Aid Queen performance, at 16:38 you can see a wave going to the back of the stadium from the people clapping. That wave is the speed of sound, caused by the people at the back hearing the music a split second before the people at the front.

Read more youtube.com

via reddit.com

JEJl TIL that, since 1950, acceptance of an Academy Award statuette requires that neither winners nor their heirs may sell the statuettes without first offering to sell them back to the Academy for US$1. If a winner refuses to agree to this stipulation, then the Academy keeps the statuette.
e0rBg TIL that U.S. area codes were influenced by the rotary dial, where smaller numbers are dialed faster than longer ones. The first digit could not be one or zero, but the second had to be one or zero. Therefore, the most quickly dialed code was 212; the slowest was 909. This system existed until 1995.
m1rjo TIL that humans can maintain only around 150 stable relationships, a concept known as 'Dunbar’s Number'. This theory, proposed by anthropologist Robin Dunbar, suggests that cognitive limitations restrict the number of meaningful social connections we can sustain.
R841 TIL that a man robbing a Sprint store painted his face gold as a disguise. Afterwards he was having trouble breathing and died wheezing shortly after the robbery took place. And the witnesses were still able to identify him making his “disguise” useless.
oBGlo TIL the reason snow is able to absorb sound is because it is porous. Snowflakes are six-sided crystals, and they are filled with open spaces.Those spaces absorb sound waves, creating a quieting effect over a blanket of snow.