https://www.nature.com/articles/s41377-020-00367-8

That's a relevant paper, but this is the one which "deepened" the mystery: https://www.nature.com/articles/s41467-024-52362-x

It asserts:

> L-proteins need not emerge from a D-RNA World

So if more than one amino acid chirality could have emerged, why did we get the one we got and not several?

From the paper in the parent comment:

> Achiral linearly polarized light interacts with chiral objects and their enantiomers differently. An interesting example is a light-driven motor. Linearly polarized light can rotate a gammadion-shaped gold structure embedded in a silica block as a motor.

Imagine you were using some kind of optical tweezers to manipulate chiral molecules. I wonder if there's a reason that such a device would work better if you had a sample which had the same chirality. Suppose so...

If one of your samples made its way to Earth and replicated... Well that would be a reason for earth proteins to be biased in one direction, despite the laws of physics not prescribing such a bias.