Colossal Biosciences scientist Beth Shapiro holds a portion of a woolly mammoth tusk recovered from the Arctic. Rob Stein/NPR hide caption When the elevator doors part on the second floor of a two-story brick and glass building in an office park on the outskirts of downtown Dallas, it feels like a portal opening to a different world.

Engineered bacteria that eat tumors from the inside out could provide a new approach in the fight against cancer, report researchers from the University of Waterloo in Ontario, Canada.

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