Scientists have warned that research into "mirror life" organisms — hypothetical life forms made up of molecules that perfectly mirror those found in regular life — should be stopped.

Theoretically, it's a cool idea. But some scientists are worried that these life forms, if they're ever realized, could turn into a major risk for the world around us by turning into an unstoppable force that spreads without limits, overrunning and choking out natural organisms in its path.

As Nature reported last year, mirror organisms could pose risks to pretty much all existing life if unleashed. They'd be like the ultimate invasive species, with no natural predators, and capable of evading pathogen detection systems found in nature because they're just so radically different.

In a 300-page technical re

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