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Researchers have demonstrated a way to heat polyethylene—the plastic used in many bags and containers—so it breaks down into hydrogen gas and graphene, a form of carbon just one atom thick. The approach could turn waste plastic into two useful materials, although scaling it up remains a challenge.

The granitic Seychelles sit on a submerged block of granite that lay between Madagascar and India before Gondwana broke apart. The islands’ granite was cited as evidence for continental drift.