Matter & Energy

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BRILLIANCE  Four new books put Einstein’s general theory of  relativity in historic and scientific context. 

warped spacetime

GETTING A GRIP ON GRAVITY  Einstein's general theory of relativity explains gravity as a distortion of space (or more precisely, spacetime) caused by the presence of matter or energy. A massive object generates a gravitational field by warping the geometry of the surrounding spacetime. 

fizzy chemical

BUBBLE POWER  A fizzing chemical leaves a jet of bubbles in its wake as it races through a liquid. Such bubbles could propel drugs into wounds to stop blood loss. 

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