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If a country wants to keep a nuclear bomb test secret, it’ll probably do it deep underground.

Carbon is the fourth-most-abundant element in the universe and takes on a wide variety of forms, called allotropes, including diamond and graphite. Scientists at Carnegie's Geophysical Laboratory are part of a team that has discovered a new form of carbon, which is capable of withstanding extreme pressure stresses that were previously observed only in diamond. This breakthrough discovery will be published in Physical Review Letters.

By Amanda Mascarelli of Nature magazine Three coastal-restoration projects intended to rescue Louisiana's rapidly shrinking wetlands have failed to restore marsh during the past two decades. Instead, the schemes -- which involve diverting fresh water from the Mississippi River in the hope of carrying sediment to marshes and aiding plant life -- have made these regions more vulnerable to hurricanes, according to the authors of a study published by Geophysical Research Letters . Louisiana's coastal wetlands are up against a host of natural and anthropogenic factors

Ice loss from the massive ice sheets covering Greenland and Antarctica is accelerating, according to a new study. If the trend continues, ice sheets could become the dominant contributor to sea level rise sooner than scientists had predicted, concludes the research, which will be published this month in the journal Geophysical Research Letters