Hello, SFIA audio listeners. In this month's Nebula exclusive, big alien theory,

we're asking the reason alien civilizations might be rare is because most aliens are huge.

To hear it and every episode early and add-free, plus hours of bonus content,

check out go.nebola.tv slash Isaac Arthur and use my code, Isaac Arthur.

Our reality may be but one of virtually infinite versions out there in the multiverse, where anything

which can happen will happen, which means if it is possible to travel to other parts of the

multiverse, someone is bound to invade eventually over and over and over again.

These are you all.

Some months back we were discussing what current theory and physics taught us about how wars fought across time might happen,

and about time travel paradoxes

in general, and there were a lot of requests for a follow-up discussing how wars between universes

in a multiverse might work. Since this weekend has the release of Quantum Mania, the newest

Ant-Man and MCU film, and the Big Bad is supposed to be Kang the Conquer, my second favorite

comic villain after Doctor Doom, whose stick is multiverse and temporal wars, it seemed

a great place to begin that conversation, along with talking about some of the different

ways quantum mechanics seeks to explain alternate universes and timelines, and some of the

confusion in height that often comes

with quantum, especially in science fiction and comics.

We'll try to end the day with a better understanding of how quantum works, without resorting

to lots of math, confusing examples, or wrecking some great sci-fi stories just because

their science is iffy.

Now speaking of that, while we will discuss Kang and other fictional examples today, and

...