41 and more Ulam's Spiral

Alex Bellos discusses how the Incans used knots in string (Quipu) to record numbers.Check out Brilliant (get 20% off their premium service): https://brillian...

More on prime numbers and Ulam's Spiral - this time focusing on 41 and Arthur C. Clarke.

This video features Dr James Clewett.
More Clewett videos at: http://bit.ly/JamesClewett

See our other Ulam Spiral video at: http://youtu.be/iFuR97YcSLM

The book discussed is The Garden of Rama.