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Happy 86th birthday to Vera Rubin (b. July 23, 1928), a pioneering astronomer who uncovered the galaxy rotation problem. While attempting to explain the galaxy rotation problem, she encountered some of the most firm evidence up to that time of dark matter.

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Cantwo,Kent,Atom,Case,Frankfurt a Main, Sachsenhausen, 2012

Today, Mr. Kelly Jasper (@3.6.9.12) goes deep (and we mean DEEP) into the history of planetarium watches, and explains the incredible new piece from @vancleefarpels. This is one you can’t miss. (at www.hodinkee.com)

The brachistochroneThis animation is about one of the most significant problems in the history of mathematics: t

he brachistochrone challenge.

If a ball is to roll down a ramp which connects two points, what must be the shape of the ramp’s curve be, such that the descent time is a minimum?Intuition says that it should be a straight line. That would minimize the distance, but the minimum

timehappens when the ramp curve is the one shown: acycloid.Johann Bernoulli posed the problem to the mathematicians of Europe in 1696, and ultimately, several found the solution. However, a new branch of mathematics, calculus of variations, had to be invented to deal with such problems. Today, calculus of variations is vital in quantum mechanics and other fields.

The Epic A. Lange & Sohne Datograph In 18K Solid Gold

Batman Supervillains-Diagram Part 2:http://www.crackajack.de/2014/07/22/batman-supervillains-diagram-part-2/