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crystal structure

TIME CRYSTAL  Crystals can form in time as well as in space, scientists have confirmed. Scientists hit a chain of ions with lasers to create the time crystal, which undergoes symmetry breaking in time, just as a normal crystal (shown above) breaks the symmetry of space.

COOLING OFF  A newly penned international agreement will phase out the potent greenhouse gases currently used in many refrigerators and air conditioners, prompting scientists and chemical companies to look for eco-friendly alternatives.


BUBBLING UP  Scientists have found bubbles in a medium very different from these oxygen bubbles — an atomic nucleus. The researchers found that silicon-34 has a “bubble nucleus” with few protons in its center.

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