She nodded. "A few hundred people may read my Doctoral Thesis on deepwater shark diets. Millions saw my television show, and it changed public attitudes. It helped with the push for marine reserves and protections. Which do you think did the most good? Which do you think I'm prouder of as I look back?"

"The show," I said.

"Exactly. You've changed more with your foundation and your tagging program than anything you'd do at a university. I bet you're having more fun, too."

I looked out over the water as we ate lunch and waited to arrive at our next dive site. "A lot more," I said. "I'm so busy...