Texas A&M's Yige Zhang co-authored new study proving Earth's carbon dioxide atmospheric concentrations averaged 230 parts per million for 2.5 million years; today's levels are about 410 parts per million
Researchers found that short-term exposure to ambient air pollution was associated with exacerbations of psychiatric disorders in children one to two days later
The findings showed that of nearly 3 billion birds lost, 90 percent belong to 12 bird families, including sparrows, warblers, finches, and swallows—common, widespread species
These new meters are available in two versions—the ST400, specifically designed for pH analysis and the ST400M—a multi-parameter meter ideal for both pH and conductivity testing