New York City’s hidden old-growth forests

Tree-ring scientists have mined rare old-growth timbers from demolition at an iconic Manhattan building to produce historical and climate data. Ongoing salvage efforts at other buildings promise to expand on these findings.

Source of DNA mutations in melanoma

The mutations that give rise to melanoma result from a chemical conversion in DNA fueled by sunlight — not just a DNA copying error as previously believed, reports a new study. The findings upend long-held beliefs about the mechanisms underlying the d…