The new images -- taken over several years -- reveal the channels which were carved out by flooding over an estimated 500 million year period -- a time when Mars was thought to be cold and arid.

ENGADGET: Alt-week 3.9.13: Sunstones, knotted vortices and a zero-g robot

Feldstein estimated that a fairly comprehensive cap could cut the deficit by almost half over time.

FORBES: Let's Bribe Taxpayers To Give Up Tax Breaks

They looked at 119 genes that have accumulated mutations over the passage of time, allowing the relative times of origin of each species to be estimated.

BBC: Earth AP