Neil deGrasse Tyson
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The brain app.
Yeah, right here.
Also, you can ask, what are the chances we would catch an ET disease if he comes to Earth?
What's the chance of that?
Contamination.
And here's the problem.
The kinds of diseases we think about and know about tend to be very specific to the life forms.
Think about it.
So an oak tree is not going to get whooping cough.
And just like there are certain viruses that will not be transmitted trans-species.
Across species.
They have to mutate in order for that to happen.
So the idea that an alien from another planet has something that's contagious to us is kind of low.
Because a lot of things that are contagious to other life forms on Earth with whom we have DNA in common are not contagious to us.