Since the diagnosis, you've never once had that, I guess, that feeling in your stomach of panic?

No, no. No. I have feelings sometimes of fear of what happens.

But as soon as I get that, I say, wait a minute, wait a minute.

You've been around a long time, old man.

You've had a great life.

You've had a great experience.

I want, when I leave, that the ceremony is at the Naval Academy, and we just have a couple of people that stand up and say, this guy, he served his country.

Before you put handcuffs on someone and take them away, that you've got to make sure that you've got your case together and that the facts add up.

And in these cases?

Facts didn't add up.

The U.S. government has launched aggressive investigations and a greater number of prosecutions to stop the theft of American trade secrets by suspected Chinese spies.

But we've discovered the dragnet is ensnaring a growing number of Americans who aren't spies at all.

Harvard's class of 2018 is likely to include leading cancer doctors, future hedge fund titans, tech entrepreneurs,

and professional wisecrackers.

For more than a hundred years, this castle in Cambridge, part secret society, part writing room,

has housed the Harvard Lampoon, which continues to produce some of the great comic minds in America.

Honestly, Smithies, I don't know why Harvard even bothers to show up.

Tonight, we'll take you inside.

I'm Steve Croft.

I'm Leslie Stahl.

I'm Scott Pelley.

I'm Anderson Cooper.

...