# We Use Math Blog

## How many ways can you arrange 128 tennis balls?

How many ways can you arrange 128 tennis balls? The answer is about 10^250, also known as ten unquadragintilliard. This number exceeds the total number of particles in the universe! Find out more about how researchers solved this problem here!

## John Urschel: NFL Athlete, Mathematician

Baltimore Ravens offensive lineman John Urschel will begin a PhD in mathematics at the Massachusetts Institute of Technology this year. He graduated from Penn State with a 4.0 GPA. His PhD studies will focus on spectral graph theory, numerical linear algebra, and machine learning. In a previous interview, Urschel told a reporter that he spends time on road trips reading math books and research papers. Read more about this incredible athlete-mathematician here!

## Chocolate Fountains

Why does the falling curtain of chocolate on a chocolate fountain pull inwards rather than straight downwards?

One mathematics student figured out that chocolate fountains follow the same pattern as ‘water bells, ‘ which fall inwards because of surface tension. You can make your own water bell at home by  putting a pen vertically under a tap with a coin flat on top, and you’ll see a bell-shaped fountain of water.