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If your Prime Day purchase doesn't meet your standards, here's how to get a refund and return the item for free.
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 Scientists have reimagined the meaning of a "light meal," creating microlasers that use natural products to emit illuminated beams through food. And they're completely edible. These mini lights, the first demonstration of laser emission from an entirely edible system, could be harnessed for everything from environmental sensors to food safety trackers and bio-barcodes.
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Amazon doesn't have a monopoly on deals. Forget Prime Day with tempting tech deals from Walmart, Target, and other retailers.
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 Nvidia today became the first public company to hit a $4 trillion market value as shares briefly rose to $164. Stock has dropped back to around $163 per share, so the company is now hovering at the $3.9T mark.
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You can save today on our top security camera pick for Alexa users. Amazon has the Blink Outdoor 4 for half price. A single camera (usually $100) only costs $50, which is only $10 more than its all-time low for Black Friday. And the half-off savings also apply to multi-camera bundles.
The Blink Outdoor 4's name is somewhat deceiving because it works just as well for indoor use. The weather-resistant camera records in up to 1080p and supports black-and-white infrared for nighttime recording. The wireless camera is powered by a pair of AA batteries.
If the impressive Blink Outdoor 4 has an asterisk, it's the company's
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