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This is CBS Eye on the World.

Here's John Batchelor.

Continuing with the senior space writer for Ars Technica, Eric Berger, his new book is re-entry.

This is Volume 2 in the Chronicles of Elon Musk and SpaceX.

That doesn't say that yet, but that's how I imagine Eric's books standing up for the next 100 years.

This is what actually happened on our way to Mars.

SpaceX, Elon Musk, and the reusable rockets that launched a second space age.

Where we are right now is December 2015.

There is a Falcon 9 on a pad in Florida, and it's launching into low Earth orbit in order

to demonstrate reusability.

That's everything.

Reusability not only means landing the booster, but refurbishing it and getting it ready to move as fast as possible.

Not once a month, not once a week, not even at this point every nine days or six days, but every two days is what they eventually get to.

That's right. This reminded me,

Eric, of building Liberty ships in the Second War. We started with a month, and you got it down,

they could do it in 24 hours to get a ship out to sea. We come to that day of the launch from,

it used to be called Pad 13. No, it used to be called, where do they launch

...