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Dr. Mercury Jhaitin pic for the back cover of the book.

Mercury Jhaitin pic for the back cover of the book.

Ant Death Spiral: A circle of army ants, each one following the ant in front (because they use scent/pheromones to follow each others' trails since they are blind), becomes locked into a circular mill. They will continue to circle each other until they all die.

This is one of my favorite things about ants -- the ant death spiral. Actually, it's a circular mill, first described in army ants by Schne.

't Rommelparadijs, een 1200 vierkante meter grote tweedehands winkel  http://www.rommelparadijs.nl/

't Rommelparadijs, een 1200 vierkante meter grote tweedehands winkel http://www.rommelparadijs.nl/

The time when he got on the wrong side of the wrong people. | 22 Times Elf On The Shelf Went Way Too Far

The time when he got on the wrong side of the wrong people.

The time when he got on the wrong side of the wrong people. | 22 Times Elf On The Shelf Went Way Too Far

Hilbert's 23 Unsolved Problems (some of which have been solved): Site shows ten of these problems.

Unsolved problems: is 10 a solitary number?

My Great Grandfather standing near his apartment, two blocks from my office in SoHo.

My Great Grandfather standing near his apartment, two blocks from my office in SoHo.

Nicholas Lobachevsky (Wiki) - published about hyperbolic geometry 2 years before Bolyai.

Nikolai Ivanovich Lobachevsky (Makaryevo, was a Russian mathematician and geometer, known primarily for his work on hyperbolic geometry, otherwise known as Lobachevskian geometry, a revolutionary work in the exploration of non-euclidean geometry.

Islamic tiling graph.

Medieval Islamic artisans developed a process for creating elaborate, nonrepeating patterns now associated with Penrose tiles.

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