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What jumps when it walks and s...

What jumps when it walks and sits when it stands?

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The first user who solved this task is Djordje Timotijevic.

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I get angry, i yell, i cry

I get angry, i yell, i cry, i speak my mind, i stand up for what i believe in and i'll never apologize for being me.

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Gilles Personne de Roberval

Died 27 Oct 1675 at age 73 (born 8 Aug 1602).French mathematician who developed powerful methods in the early study of integration, writing Traité des indivisibles. He computed the definite integral of sin x, worked on the cycloid and computed the arc length of a spiral. Roberval is important for his discoveries on plane curves and for his method for drawing the tangent to a curve, already suggested by Torricelli. This method of drawing tangents makes Roberval the founder of kinematic geometry. In 1669 he invented the Roberval balance with an articulated parallelogram is now almost universally used for weighing scales of the balance type. He studied the vacuum and designed apparatus which was used by Pascal in his experiments and also worked in cartography

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