How thousands of nature's longest sperm squeeze into a tiny fruit fly

When Jasmin Imran Alsous peered down her microscope lens, she expected to see chaos—a mishmash of tangled cells.

She was viewing the inside of a male fruit fly's sperm storage organ, using a powerful microscope at the CCBScope Observatory, the experimental biology lab at the Center for Computational Biology (CCB) at the Simons Foundation's Flatiron Institute in New York City. ...