[muir_redwoods]

There's a similar article in this month's on-line Scientific American about multiverses. By some theories, multiple universes is the only way to explain causality but I'm bothered about the though of an endless series of me eating that tainted potato salad at the picnic three years ago. I suppose, though, that in at least one of the universes I killed the SOB that made it.

[Tom Bombadil]

but I'm bothered about the though of an endless series of me eating that tainted potato salad at the picnic three years ago.

According to the theory, only one of you may have chosen to eat the Potato salad. No tummy ache for the rest.