Alan began. "I was an overachiever, I'm afraid. In my sophomore year, first semester, I got a B in Chemistry and panicked. I thought it was the end of the world. But then I dropped a couple of extracurriculars, knuckled down, and brought that grade right up."

"I was good in everything but French Lit," Consuelo said.

"I nearly flunked out!" Lizzie said. "Everything was difficult for me. But then I decided I wanted to be an astronaut, and it all clicked into place. I realized that, hey, it's just hard work. And now, well, here I am."

"That's good. Thanks, guys. Here's the third, from Maria Vasquez."

_"Is there life on Titan?"_

"Probably not. It's _cold_ down there! 94 degrees Kelvin is the same as -179 degrees Celsius, or -290 degrees Fahrenheit. And yet ... life is persistent. It's been found in Antarctic ice and in boiling water in submarine volcanic vents. Which is why we'll be paying particular attention to exploring the depths of the ethane-methane sea. If life is anywhere to be found, that's where we'll find it."

"Chemically, the conditions here resemble the anoxic atmosphere on Earth in which life first arose," Consuelo said. "Further, we believe that such prebiotic chemistry has been going on here for four and a half billion years. For an organic chemist like me, it's the best toy box in the Universe. But that lack of heat is a problem. Chemical reactions that occur quickly back home would take thousands of years here. It's hard to see how life could arise under such a handicap."

"It would have to be slow life," Lizzie said thoughtfully. "Something vegetative. 'Vaster than empires and more slow.' It would take millions of years to reach maturity. A single thought might require centuries...."

"Thank you for that, uh, wild scenario!" Alan said quickly. Their NAFTASA masters frowned on speculation. It