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To the naked eye, the tissue beneath the surgeon’s scalpel looked uniform—a sea of reds and pinks. But Dr. Elena Vance wasn't looking with her eyes alone. She was using a laser-induced probe, a "light-wand" developed by the Marcu Lab, to scan the invisible architecture of the cells.

Inside the operating theater, the air was humming with the low vibration of cooling fans and the steady rhythm of a heart monitor. The room was dark, save for the glow of several monitors. On one screen, labeled , a map of colors began to bloom. lauramarcuweb_0738.jpg

As the probe glided over the surface, the screen flickered. A patch of deep, electric violet appeared in the center of a field of soft amber. "There it is," Elena whispered. To the naked eye, the tissue beneath the