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Federal health regulators have signed off on the first new sunscreen ingredient for the U.S. market in more than 25 years. The announcement Tuesday by the Food and Drug Administration will give Americans access to a skin-protecting chemical long used in Europe. The FDA says the chemical, bemotrizinol, meets the agency’s standards for protecting from dangerous sun rays while causing little irritation. It will initially be sold in the U.S. under the brand name Parsol Shield. Efforts to introduce new sunscreen products have long been delayed by the FDA’s bureaucratic system for updating its list of safe drug ingredients

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Humanoid robots struggling with tasks like grasping a cup have a new teacher — a person wearing an ultrasound wristband that captures the movement of muscles, tendons and ligaments beneath the skin. Researchers at the Massachusetts Institute of Technology developed the tool to collect data of human hand motion that could eventually help robots achieve the dexterity that has been difficult for machines to master. As much of the tech world is still captivated with artificial intelligence assistants that are taking on computer-based tasks, the researchers are among the scientists trying to imbue AI with more sensory data from the physical world.