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E-mail from listeners prompts two corrections: One about Latin confusion and the other about the Gateway Arch in St. Louis. MANY listeners wrote in to point out that the Arch is not a parabola, as we ...

Researchers have found that plant root tips commonly converged to a catenary-curved shape because of restrictions imposed by one-directional and localized tissue growth. Plant roots need to be able to ...

The pantograph-catenary interaction constitutes a vital component of high-speed rail systems, acting as the sole conduit for electrical energy transfer to moving trains. This interface is subject to ...