Still at work on the piranha theorems

We’re still at work on the piranha theorems. But, in the meantime, I happened to show somebody this:

There can be some large and predictable effects on behavior, but not a lot, because, if there were, then these different effects would interfere with each other, and as a result it would be hard to see any consistent effects of anything in observational data. The analogy is to a fish tank full of piranhas: it won’t take long before they eat each other.

And she said, wait, you better check to see if this is right. Are piranhas cannibals? That doesn’t seem right, if they’re cannibals they’ll just eat each other and die out. But if they’re not cannibals, the analogy doesn’t work.

So when I got home, I looked it up. I googled *are piranhas cannibals*. And this is the first thing that came up:

So my analogy is safe, and we’re good to go.

P.S. I guess I could’ve titled the above post, Are Piranhas Cannibals?, but that would’ve violated the anti-SEO principles of this blog. Our general rule is, make the titles as boring as possible, then anyone who clicks through to read the post will be pleasantly surprised by all the entertainment value we offer.

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