› added 11 years ago

587

TIL that yellow teeth are stronger than white ones, since the natural colour of our teeth is light yellow or grey. Products which whiten our teeth can permanently weaken them.

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rNw1x TIL Triceps make up 70% of an arm’s total mass!
lxWB TIL that the phrase “under God” wasn’t part of the Pledge of Allegiance until 1954, and that its adoption was largely due to pressure from the Knights of Colombus
gmYy TIL that in 2006 a private company launched 2 unmanned inflatable space stations, they are still functioning and combined have completed over 80,000 orbits of the earth
mAyM TIL that lactase persistence, or the ability to digest milk properly, only developed in humans around 7,500 years ago.
JYMm TIL George Washington was given the rank of “General of the Armies” posthumously on July 4, 1976 in order to permanently make him the senior military officer of the United States.