A new analysis of the ancient Indian Bakhshali manuscript suggests the numerical symbol zero, as we use it today, may be centuries older than previously believed.
Aug 3
What Is the Deepest Hole in the World?
Alongside the Space Race, the mid-1900s saw another contest of engineering -- a race downward, into the Earth. Learn why the USSR created the Kola Superdeep Borehole (the deepest artificial or natural hole we know of), what we learned from it, and how this research continues in t ... Show More
14m 51s