Yet it was in places like this that Cloud and Barghoorn found the oldest signs of life.
NEWYORKER: The Martian Chroniclers
Barghoorn focussed on Australia, Cloud on Death Valley, others on China and Brazil, trailing graduate students behind them.
Yet Barghoorn, embroiled in personal troubles, sat on the results for several years.
Cloud replied, but he eventually agreed to let Barghoorn publish first.
In the half century since Cloud and Barghoorn began scouring the globe for similar sites, the history of life on Earth has been traced back nearly three and a half billion years.
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