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Achievement unlocked: Rewritable paper. Yadong Yin

Reprintable paper becomes a reality

Coating paper with an inexpensive thin film can allow users to print and erase a physical page as many as 80 times. That reduces both the cost and the environmental effects of paper use.
Former President Jimmy Carter in Aug., 2015 at Maranatha Baptist Church in Plains, Ga. Carter was undergoing treatment for advanced melanoma at the time. Via AP. David Goldman/AP

Melanoma: Taming a migratory menace

Melanoma, the deadliest form of skin cancer, can usually be cured when caught early. When it has spread, however, it becomes a challenge. Recent findings are bringing hope. Here are a few examples.

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