With his General Theory of Relativity, Einstein illuminated the grand expanse of the cosmos, but he was also instrumental in developing quantum mechanics for describing the microworld. In Einstein’s day, these advances were considered unrelated but recent insights suggest that they may be secretly connected–significantly advancing our understanding of quantum threads that may stitch the fabric of spacetime. Leonard Susskind, Ana Alonso-Serrano and Mark Van Raamsdonk join Brian Greene to examine this newfound link and explore its implications for uniting the laws of the large and those of the small.