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 ad-free,

plus hours of bonus content,

check out go.nebola.tv slash Isaac Arthur,

and use my code, Isaac Arthur.

A key criticism of our search for extraterrestrial intelligence, or SETI, is that we might

be looking in the wrong places, the wrong type of stars or planets, or that we should

be investigating sightings here on Earth.

But what if the easiest place to find aliens is to look in the mirror?

So today is our monthly sci-fi Sunday here on SFIA, where we look at concepts better known

from sci-fi than science and ask how realistic they are, or if science allows any pathway to a

given technology or

situation. And today we are also making a long-awaited return to our Alien Civilization

series, as it's been over 40 episodes since our last entry in the series, Hungry Aliens,

back in the spring. So I thought it was past time for a return, and when one of our audience

members suggested this to me, I didn't even put in one of our audience image balls, I just

stuck it right on the schedule, because it's a topic that is long overdue, because there's

very few topics that come up in regard to aliens more often that we are in some way related

to them, that we are a

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