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1932

Climate Change

Blueprint-like illustration of a fly with its wings spread out
Living World

How do body parts grow to their right sizes?

FIVE BIG QUESTIONS: Some cells seem to know what to do. Others apparently take their cues from outside. But really, “We don’t get it.”

Drawing of four hourglasses of different sizes with various creatures inside them: an insect, mouse, human and elephant.
Living World

How does the embryo make all its parts at just the right moments?

FIVE BIG QUESTIONS: If events weren’t properly timed, pandemonium would ensue. Researchers are ferreting out the internal clocks that control developmental sequence and scheduling.

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