University of Pennsylvania researchers tweaked an AI tutor to tailor the difficulty of practice problems for each student.

Here’s what you’ll learn when you read this story: Single-celled organisms aren’t often associated with complex functioning, but a new study suggests that at least some protists exhibit what’s known ...

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Add Yahoo as a preferred source to see more of our stories on Google. Amazon is now offering one-hour delivery. The idea is to offer faster fulfillment on items you could typically find at a big-box ...

The delivery wars are speeding up. Amazon is launching one-hour and three-hour delivery options across the U.S., expanding the push into rapid delivery. Customers now have the ability to shop over ...

Amazon announced Tuesday that customers in select locations can now receive even faster deliveries in as little as one or three hours for an additional fee. The e-commerce giant noted that Prime ...

Megan Cerullo is a New York-based reporter for CBS MoneyWatch covering small business, workplace, health care, consumer spending and personal finance topics. She regularly appears on CBS News 24/7 to ...

Amazon is speeding up delivery times again. The company announced Tuesday that it is now offering one-hour and three-hour delivery options on more than 90,000 products to cities and towns across the U ...

Amazon AMZN-0.36%decrease; red down pointing triangle said it is rolling out one-hour and three-hour delivery services across the U.S., as it moves to fend off a growing threat from Walmart and faces ...

Amazon is rolling out one-hour and three-hour delivery in some parts of the U.S. The company is speeding up deliveries even further after investing significant money and resources to make same-day ...