Many scientists are seriously worried about the potential threat of ‘mirror life’: hypothetical organisms built from molecules that are flipped from what we find in nature.

Many of life’s basic building blocks, including DNA and amino acids, have a certain ‘left-or right-handedness’

If that were to be flipped, like a DNA double helix twisting to the left instead of the right, then these looking-glass versions of life could sneak past the biological defenses of animals, plants, and humans.