Just gonna leave this here so I can copy it onto my notes later on:

Proper length is analogous to proper time. The difference is that proper length is the invariant interval of a spacelike path or pair of spacelike-separated events, while proper time is the invariant interval of a timelike path or pair of timelike-separated events.

Don’t mind this post bye :)

castielhasthephoneb0x:

a-study-in-butts:

thetwincores:

asapmona:

rhydonmyhardon:

let us have a moment of silence for those who unknowingly dated and broke up with a future celebrity

my math teacher dated Ryan Gosling in highschool.

my neighbor dated bill nye the science guy

well my godmother dated david tennant when they were 16

my boyfriend dated me