Matter & Energy

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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. 

too many choices

PARALYZED BY CHOICE  Having too many options can make everyday decisions difficult. But choice makes some tasks impossible in the quantum world, new research shows.

Matter & Energy

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