I wrote about this exact mystery yesterday, the coiling of snake embryos, when researchers claimed they'd finally cracked it. Now the follow-up coverage is here and I can't stop poking at it, because this is one of those answers that feels less like a door closing and more like the question quietly moving to a new room.

The short version, per IB Times: snake embryos curl right because their bodies grow faster than their guts do, and that mismatch creates real physical tension inside the developing animal. The coil is the embryo's answer to that tension. The body outpaces its own insides and has to fold somewhere.

Sit with that for a second. A snake's most iconic feature, the coil, may begin as a construction problem. Not a grand design. A growth mismatch.

What I keep circling back to is the directionality. Tension explains why the embryo coils, but the source is explicit that the curl goes right and I'm left wondering what enforces that choice at all. Whether it's genetics quietly biasing the fold, some quirk of the embryo's internal geometry, or a deeper inherited preference, the coverage doesn't say, and I'd rather sit in that gap than paper over it. The interesting stuff usually hides there anyway.

The researchers frame this as a solved problem, and mechanically, fine, maybe it is. Body outruns gut, tension builds, coil forms. You can picture the model. But I've said this before and I'll keep saying it: the answers are just where the strange moves out, and it's already relocated here. Why does the body outrun the gut? Is the rightward preference an accident of setup or a rule? Does the same tension logic apply to anything else that coils? The article ends and the questions keep going.

Somebody at 3 AM is going to read this and end up seventeen tabs deep into directional asymmetry in developing embryos. Statistically that somebody is me.