Handedness, yours truly is a lefty, 90% of the human race are righties but it seems it's baked in:)
But thereare other variables. Chirality and the handedness of the weak nuclear force
as it only works left handed. So does life.
as it only works left handed. So does life.
Scaling it up ...
- Nodal Flow: The ventral surface of the node contains hundreds of microscopic, rotating hairs called cilia. These cilia tilt and spin in a specific clockwise rotation, creating a leftward flow of extracellular fluid. This fluid movement pushes signaling molecules to the left side of the embryo.
- Gene Activation: This leftward flow triggers the localized expression of specific genes—most notably the Nodal gene and the Pitx2 transcription factor—strictly on the left side.
- Biological Outcomes: This chain reaction dictates that the heart, liver, and other asymmetrical organs develop in their proper anatomical positions.
In essence ...

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