Someday we must collect these rocks and bring them back to terrestrial laboratories to read their records for clues to the biological potential of Mars.

A paleontologist searches for others things like teeth, claws, footprints and skin. They search for these clues in rocks that have preserved the dinosaurs for millions of years.

I think if the Vatican is smart, someday they'll collect my work.

We cater to 'smart kids' as well. It's important that the smart kids help others that need it.

Searching for fossils also comes in many flavors, from microscopic siftings through tiny grains, to overland reconnaissance for suitable bedding settings to uncover bones,

Ultimately, it will take sample return of any putative 'fossils' to convince the scientists of the world. But we can tell a lot in situ [on-the-spot] before such a time,