My brother-in-law is hauling sand to my son and his girlfriend who are bagging/tying/throwing/stacking the bag on the dike to protect my mother, my sister, my nieces and the house of my cousin - who has evacuated - from the highest water levels the towns have ever seen. My classmate, the mayor of Moorhead, is proud of their efforts and thanks them all. All of us do too. Can we help them refill their cupboards?
Behold the Manifold, the Concept that Changed How Mathematicians View Space
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In the mid-19th century, Bernhard Riemann conceived of a new way to think
about mathematical spaces, providing the foundation for modern geometry and
physics.
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