Wisdom is the retention of innocence through adversity.

It's been a century since Albert Einstein proposed his general theory of relativity, and it still remains our best explanation of the phenomenon of gravity.

In this free download, we outline specific examples of how Einstein's theory has stood the test of time, from the gravitational redshifting of light, to the equivalence principle, to the deflection of light by cosmic bodies. We'll also examine the ways the general theory of relativity has been tested, most recently with gravitational wave detectors.

But, how can we tie Einstein's theory to the rest of physics? Is there a single theory of everything? Researchers continue to seek answers, and our download outlines how.

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