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Millions of pacemakers have been successfully implanted in the past half century to regulate erratic heartbeats , but the electrical leads, which connect the device to the heart, complicate the surgery and increase infection risks. The heart's continuous and vigorous beating also creates strain on the leads and can damage them over time. [More]

By Deborah Zabarenko, Environment Correspondent WASHINGTON (Reuters) - Summer monsoons that provide up to 80 percent of the water South Asia needs have gotten drier in the past half century, possibly due to aerosol particles spewed by burning fossil fuels, climate scientists said on Thursday. [More]