The die-off was least severe in the southern bay, where there was a 7 percent overall decrease and where new beds were found in the main stem of the James River.

WSJ: Chesapeake Bay grasses decline again

Over the years, I gradually worked my way downstream from the West Branch to the big riffles and eddies of the Main Stem, where wild rainbow trout, more tolerant of warmer temperatures, reign supreme for the 35 miles between Hancock and Callicoon.

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That pluripotent ability, and the fact that stem cells self-renew, is the main attraction of stem cells from human embryos.

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Syria's main threats to Israel stem from Assad's support for Palestinian terrorists and Hezbollah, and from his ballistic missile and nuclear programs.

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They believe a single type of cell may be cancer's main growth engine:mutant stem cells that, though barely present, spawn other cells that then spark growth.

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Barclays believes the main reasons for these declines stem from poor ore grades being mined as well as disruptions in the form of strikes, with some pipeline cuttings, and poor weather.

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Mike Lynch's main concern, however, was about the teaching of STEM subjects - science, technology, engineering and maths - in secondary schools where he felt we were falling behind.

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While display ads used to be the main revenue driver, these days the majority of sales stem from real estate agents who pay a monthly subscription to market to consumers through the Zillow platform.

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If the main root has "eyes, " the small round nubs from which a new stem emerges, make sure each baby you cut off has one of these.

WSJ: In the Garden, Divide and Multiply: Weekend Gardener