Stephen Hawking made his most famous scientific contributions studying what?

Which ancient Greek scholar calculated the size of the Earth with surprising accuracy around 240 BC?

Antoine Lavoisier identified which gas as essential to burning and breathing?

What is the name for Alfred Wegener's theory that Earth's continents were once joined together and slowly drifted apart?

Ernest Rutherford is credited with discovering the center of the atom known as what?

Carl Sagan brought science to millions through which famous television series?

Which mathematician developed calculus at the same time as Isaac Newton, sparking a famous feud?

Johannes Kepler discovered that planets move around the Sun in what shape of path?

Galileo Galilei improved the telescope and used it to study what?

Which English physician first correctly described how blood circulates through the body?