Learn how to calculate the equation of a line from a graph, work out the gradient from an equation, and visualise intercepts with this step-by step guide.

Handwritten Example of Famous Einstein Equation Gets $1.2M The one-page handwritten letter in German to Polish American physicist Ludwik Silberstein is dated Oct. 26, 1946 ...

A letter written by Albert Einstein in which he writes out his famous E=mc2 equation has sold at auction for more than $1.2 million.