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How many different squares c...

How many different squares can be found in the shape shown in the illustration?

Correct answers: 165

The first user who solved this task is Ilan Amity.

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Pretending to be happy

Pretending to be happy: Raise your hand if you have been acting like you are all ok, but inside you are really not.

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Reinforced Concrete

In 1867, reinforced concrete was patented by F. Joseph Monier (1823-1906), a gardner in Paris, to reinforce garden tubs, beams and posts. The French inventor had found that the tensile weakness of plain concrete could be overcome if steel rods were embedded in a concrete member. The new composite material was called reinforced concrete, or ferroconcrete. William E. Ward builds (1871-75) the landmark building, first in the U.S. to use reinforced concrete, for a private house in Port Chester, N.Y., It was designed by architect Robert Mook.

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