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

we're asked at 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.

Some months back we were discussing what current theory and physics told us about how wars

fought across time might happen, and about time travel paradoxes in general, and there

were a lot of requests for 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 and hype 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 we'll actually

discuss how you might fight wars across the multiverse, I want to emphasize this isn't an

episode on him or the new film, which I haven't seen prior to writing the script for today's

...