I will start with the amazing

**Brachistochrone curve.**

What is this u ask! Well its the fastest path to take between two points(one being higher on the y axis than the other).

And i just discovered it today and it blew my mind.

So this curve can be obtained by tracing the path that a point on the circumference of a rolling disk would have to travel. And apparently following this curve gets you the fastest between two points thx to gravity and math. What amazed me even more was that the shortest(most direct) path between two points is actually one of the slowest ways to get there.

Moreover the brachistochrone curve is also known as the tautochrone(tauto meaning same/equal) curve which means that any obect travelling it will arrive at the final destination at the same time no matter from where it started!!

I'll let my homies Vsauce a Adam savage give you guys more insight about it in this here vid:

So what was the last thing you learned that amazed you?