I make short, to-the-point online math tutorials. I struggled with math growing up and have been able to use those ...

I make short, to-the-point online math tutorials. I struggled with math growing up and have been able to use those ...

In the third century BCE, Apollonius of Perga asked how many circles one could draw that would touch three given circles at exactly one point each. It would take 1,800 years to prove the answer: eight ...