Swirling vortices are clumped together on the surface of the Sun in colors that range from bright yellow to dark orange and black.

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On the left, a circle with black dots evenly distributed along the outer perimeter has lines of equal opacity but varying color connecting each dot with all the others. On the right, a second circle with black dots along its perimeter has brown lines connecting each dot to the others. The lines are fainter when the connected dots are more separated.

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A shaken lattice of ultracold atoms can simulate extreme quantum chaos

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An illustration on the left shows a multicolored cloudlike oval centered in a square with its bottom side labeled X and its left side labeled P. Three lines pass through the oval at different angles. Above the oval, a red vertical line points to a red curve in a box labeled 90°. To the right of the oval, a blue horizontal line points to a blue curve in a box labeled 0°. At the top right corner of the oval, an orange diagonal line points to an orange curve in a box labeled 45°. A 3D graph on the right has an x-axis labeled X, and a y-axis labeled P, with both axes spanning values from −3.4 to 3.4. A vertical axis is labeled W(X,P) and spans from 0 to 0.2. A smooth, contoured bump is plotted on the graph with its highest vertical point centered where X and P are zero.

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From the vault: October 1979 - A physicist in biomedical investigation

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