Civis and his coauthors maintain that formamide could have persisted on early Earth, or been carried by a comet.
I'm not sure how a nation that prides itself on its democracy and fairness in what is so often referred to as the greatest country on earth could allow such flaws to persist.
The romantic notion I had about the red earth at the heart of Australia still persists but the red dirt here is trying to ruin it by getting into EVERYTHING yet I am still having a lovely time.
The whole world was watching when Comet Shoemaker-Levy 9 fell apart and its pieces crashed into Jupiter in 1994, leaving Earth-size marks that persisted up to a year.
So why then do well-intentioned schools, councils and green groups - and let's face it, Live Earth was an eight-hour tip-fest - persist in promoting such ineffectual actions?
The classic image of India in summer — the photographer's cliché of a line of women walking across parched earth with water pots perched on their heads — might persist.
No prizes in heaven or on earth are guaranteed for this kind of faith, but he persists because it is, like prayer, its own reward.
Microbial consortia constitute a majority of the earth's biomass, but little is known about how these cooperating communities persist despite competition among community members.
By the 19th century, religious and romanticized images of maternity gave way to a more down to earth approach, though the notion of mother as vessel without much control persisted.
The human and ecological consequences of the first global collapse are likely to persist for many generations, perhaps for our species' remaining time on earth.
