Explanation

Calculating the radius of the earth over a thousand years ago required a lot of imagination.

The 10th-century Persian mathematician Abu Rayhan al-Biruni used simple trigonometric results to estimate the radius and circumference of the Earth

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Explanation

Radioactivity was discovered by Henri Becquerel in 1896.

They discovered radioactivity proving that the uranium emitted radiation without an external source of energy such as the Sun

Marie Curie with her husband Pierre Curie, coined the term radioactivity.

In 1903, Henry Becquerel shared the Nobel Prize for Physics with Pierre and Marie Curie

Ernest Rutherford did many experiments studying the properties of radioactive decay (alpha, beta, and gamma)

Explanation

Vinton Gray Cerf, born on June 23, 1943.

He is an American Internet pioneer known as the "Father of the Internet."

In 1997, President Bill Clinton awarded him the U.S. National Medal of Technology.

Explanation

Jabir Ibn Hayyan (721–815 CE) was a pioneering Muslim scientist known as the father of early chemistry and a contributor to biological sciences.

Explanation

Christopher Columbus discovered America In 1492.