Power of Mathematics

The Beauty and Power of Mathematics | William Tavernetti | 

https://www.youtube.com/watch?v=VIbjHIGMjQM

Math is the hidden secret to understanding the world | Roger Antonsen https://www.youtube.com/watch?v=ZQElzjCsl9o

Apollo 15: The Hammer-Feather drop

https://www.youtube.com/watch?v=TVAiVVxD-ng