Snowballs to Soot: The Clumping Density of Many Things Seems to Be a Standard (IMAGE)
Caption
High school student Jessica Young checking the packing density of random aggregates of plastic spheres in a cylinder. Young's work as a summer intern at NIST contributed to a paper arguing that rigid aggregates like those she's testing tend to clump together at roughly the same density regardless of scale, from microscopic soot to large comets.
Credit
Baum/NIST
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