Physics
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We summarize the week's scientific breakthroughs every Thursday.
- 			 Physics PhysicsPutting Einstein to the testA NASA mission has found new evidence for Einstein's theory of gravity, but its final results have been delayed by unexpected problems. 
- 			 Physics PhysicsFermilab could beat CERN to the punchA new particle accelerator starting up next year in Switzerland should finally discover the origin of mass, unless an older U.S. machine does it first. 
- 			 Physics PhysicsLiquid origamiA French team has created the first mini-origami figures that fold themselves around droplets of water. 
- 			 Physics PhysicsTiny particles baffle physicists, againAn experiment failed to confirm the existence of a new elementary particle called the sterile neutrino, but its results could still point to some new physics. 
- 			 Physics PhysicsToward imaging single biomoleculesExperiments have given additional evidence that a future generation of X-ray sources called free-electron lasers may be able to image single biomolecules. 
- 			 Physics PhysicsThis is your brain on a chipBiophysicists have put neurons on a chip and induced them to form multiple patterns of synchronized firing, the mechanism at the basis of memory. 
- 			 Physics PhysicsQuantum Capture: Photosynthesis tries many paths at onceThe wavelike behavior of energy in chlorophyll might explain how plants are so efficient at using solar energy. 
- 			 Materials Science Materials ScienceColor-tunable sunglassesEngineers have developed sunglasses that can change from dark, filtering hues to clear—and back—at the flip of a switch. By Janet Raloff
- 			 Materials Science Materials ScienceTaken for a SpinConsidering silk from the spider's perspective may offer the best chance of replicating these creatures' tough threads. 
- 			 Physics PhysicsFormula for Panic: Crowd-motion findings may prevent stampedesThe physics of pedestrian flows could help prevent stampedes such as the one that killed hundreds during a pilgrimage to Mecca in 2006. 
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- 			 Physics PhysicsCloser to Vanishing: Bending light as a step toward invisibility cloaksInvisibility cloaks may be a long shot, but new optical tricks could help in the design of future computers.