Why scientists fear Emperor penguins' annual moult may be killing them

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"Everyone has been dreaming for 40 years of one robot hand to rule the world. A lot of people think it could be the humanoid hand," says Pierce.

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But if net immigration to the U.S. stays in the red, the primary long-term effects would be fiscal in nature, as a shrinking workforce will do no favors for the country’s national debt. The Deloitte researchers wrote that immigration tends to have a “positive effect on the federal deficit, allowing revenue to rise faster than expenditure.”

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Rebecca Morelle,Science Editorand