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Commentary: Apple says its new Siri AI can handle all the details: personalized invitations, creative menus, scheduling and more. Don't expect it to bring a dessert.
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 For nearly 200 years, biologists felt they had a pretty good grasp of the nudibranch genus Thecacera. Consisting of six known species found in marine habitats around the world, these shell-less molluscs seemed as small as small could be, ranging from around half an inch to an inch long.
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