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-- an underneath light from a lantern is to hold the flashlight like that get an angle on it. >> reporter: he said washington looked like the older president washington. he painted him at 44, his age that night. and then, there is the ice. it's very unlikely there were chunks. >> reporter: he had what we would call miniature icebergs. and river ice, when a river freezes over, sheets of ice form. i studied ice. i also worked with photographs of the delaware when it's iced up. that was a big challenge actually. just figuring out lighting effects of the reflection on the ice from torches. >> repo...

Nasa is really search for signs of life if our own solar system. we won't find complex life like humans, but it is our first step in understanding life beyond earth. >> so what exactly is it that you're looking for? >> well, take mars for example. for the last ten years, we've been following water. one of the things that you have to have for life is water, we believe. and with the many missions that we have, we now know there's signs or evidence of water on mars that's all over the place. and in fact, we've discovered some layers of water underneath the soil. it's an ice form, but it's a major...