His only mistake came on the testing closing hole as a bogey five left him on nine-under 275.

CNN: G-Mac back on top after Heritage playoff triumph

Three putts from 40 feet on the par-three 17th left him seven over for the tournament and with little chance of making the halfway cut before he found yet more water on the testing par-five finishing hole.

CNN: March 2, 2013 -- Updated 1004 GMT (1804 HKT)

Then, after carefully drilling a hole into the crystals' walls and removing the few microlitres of fluid from each inclusion, the researchers began testing their samples for life.

ECONOMIST: Old salts