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    Physics + MathPhysics & Math

    Video: What is Gravity Made Of?

    ByGreg KestinThe Nature of RealityThe Nature of Reality

    Editor’s note: New data have cast doubt on the interpretation of the BICEP2 data. For an update on this story, read Inflation, Elation, Deflation: Reflecting on BICEP2 .

    This project/research was supported by grant number FQXi-RFP-1822 from the Foundational Questions Institute and Fetzer Franklin Fund, a donor-advised fund of Silicon Valley Community Foundation.