Babylonians solve quadratic equations with the completing the square method.

Greek mathematician Pythagoras' followers use geometric, visual strategies to solve equations.

Seleucus of Seleucla discovers that tides are caused by the moon.

Greek mathematician Diophantus of Alexandria begins replacing statements with symbols.

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Bhaskara replaces unknown quantities with letters, while Brahmagupta discovers ways to solve systems of equations in India.

In Iraq, Muhammad Ibn Musa Al-Khwarizmi writes a book containing the first clear explanation of solving equations by doing the same operation on both sides.

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Nicholas Copernicus discovers that the sun is the center of the universe.

Girolamo Cardano writes a book containing solutions to cubic and quadratic equations.

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Cardano publishes a book with the solutions to the quartic equation, which was discovered by his assistant Ludovico Ferrari.

Francois Viete starts uses letters to replace variables and uses the +/- signs to represent addition and subtraction.

Isaac Newton creates the law of universal gravitation.

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German mathematician Carl Friedrich Gauss proves the Fundamental Theorem of Algebra.

Michael Faraday produces first electric current.

Norwegian mathematician Niels Henrik Abel proves that there is no general formula that solves all quintic equations.

Charles Darwin creates the theory of evolution.

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French mathematician Evariste Galois develops group theory.

Wilhelm Roentgen invents X-rays.

Marie Curie creates the theory of radioactivity.

Albert Einstein publishes Theory of Relativity.

German mathematician Amalie Noether makes discoveries about noncommutative algebras.

Georges Lemaître proposes the Big Bang Theory.

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