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A steady stream of plasma donors has been rolling up to Dr. Donato's clinic.

One by one, they're hooked up to a machine that spins and separates their blood cells

in a process called plasmapheresis.

What's left is this gold-colored liquid, plasma. It's mostly water, and in this case, millions of

antibodies. How quickly do you expect patients to respond to this therapy? A few days. A few days.

Three, four, five days. This is where the Tijuana River crosses the border into the United States.

This cement structure was built to contain flooding from rainfall.

But this isn't just rainwater.

It's a toxic mix of raw sewage from neighboring Tijuana, draining into Southern California on lower ground, eventually emptying into the Pacific Ocean.

So effectively, it's like a toilet flushing straight into this river valley.

Has anyone ever brought back something from Mars?

No.

It'll be the first round-trip adventure to any other planet.

Four previous Mars rovers have paved the way for this mission.

The last rover, named Curiosity, has been exploring and sending back images like this for eight

years. But Perseverance is the first rover that will be able to look for evidence of ancient

...