We are really pushing things to the limit in terms of their strength, so it is essential that we get the dynamics of motion right.

NEWYORKER: The Climate Fixers

Gravity, he figured, was a warping of space and time, and he came up with the equations that describe how the dynamics of this curvature result from the interplay between matter, motion, and energy.

NPR: Einstein: Relatively Speaking, a Complicated Life