New! Five stories looking at five big questions — the latest installments in our special report on "Building Bodies" (a thread) 
1. How does the embryo make all its parts at just the right moments? If events weren’t properly timed, pandemonium would ensue. Researchers are ferreting out the internal clocks that control developmental sequence and scheduling.https://knowmag.org/2S1B10l
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2. How do body parts grow to their right sizes? Some cells seem to know what to do. Others apparently take their cues from outside. But really, “We don’t get it.”https://knowmag.org/38Tc1z2
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3. How do bodies map out left and right? Early in development, an embryo must “break symmetry” to position organs and other parts correctly.https://knowmag.org/2OcTR3E
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4. How do bodies position arms, legs, wings and organs? Embryos use a ruler, of sorts, so they can create the right structures at the right spots from head to tail.https://knowmag.org/2vCnhSf
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5. Will we ever fully know how a body gets built? Research has yielded a parts list of the genes and cell types involved in development. Now it’s time for the computationally intensive task of figuring out how they interact to form a living being.https://knowmag.org/3aUcdjq
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