An ancient group of marine mollusks evolved two different ways to see — and the visual trajectory a species took may depend on a seemingly unrelated body feature, a new study suggests.
Why it matters: The findings weigh in on a fundamental question and fierce debate in biology — why does evolution follow the path it does, and can it be predicted?
Why it matters: The month's warmth means that the meteorological winter of 2023-2024 — which includes December, January and February — will very likely be the Lower 48 states' warmest on record.
