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As NPR's senior national correspondent, Linda Wertheimer travels the country and the globe for NPR News, bringing her unique insights and wealth of experience to bear on the day's top news stories.

A recent NPR/PBS News/Marist poll found nearly 6-in-10 voters say President Trump's top priority should be lowering prices. That concern is being expressed loudly in the swing state of Wisconsin.

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Notonectidae is a cosmopolitan family of aquatic insects in the order Hemiptera, commonly called backswimmers because they swim "upside down" (inverted). They are all predators and typically range from 0.5 to 1.5 cm (0.2–0.6 in) in length. They are similar in appearance to Corixidae (water boatmen), but can be separated by differences in their dorsal-ventral coloration, front legs, and predatory behavior. Backswimmers swim on their backs, vigorously paddling with their long, hair-fringed hind legs and attack prey as large as tadpoles and small fish. They can inflict a painful "bite" on a human being, actually a stab with their sharp tubular mouthparts (proboscis).