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Welcome to Stuff to Blow Your Mind, a production of iHeartRadio.

Hey, welcome to Stuff to Blow Your Mind. My name is Robert Lam.

And I'm Joe McCormick and we're back with part two of our series on A Symmetry in Life.

Now, in the last episode, we talked about the concept of bilateral symmetry. We're basically

all of the higher animals have body plans where the left and the right sides are more or less

a copy of one another. In other words, along one of the three dimensions of space, our bodies are

approximately mirrored, at least on the outside. Now, in most organisms, there are minor variations

on this type of symmetry, but occasionally, there are species with isolated but radical deviations

where like one feature on the outside of an otherwise mirror-flipped half of the body

is drastically different from what you find on the other side. Examples that came up last time

...