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Amazon’s headcount around the globe now exceeds three quarters of a million people, a major hiring milestone for the second biggest employer in the U.S.

American and United airlines say they will place passengers who refuse to wear a face mask on an "internal travel restriction list" and bar them from future flights for an indeterminate period.

Among the world's top 20 universities for artificial intelligence research, 16 are in the US, including the Massachusetts Institute of Technology and Carnegie Mellon University, according to the American National Science and Technology Council.

Amazon’s stock is now trading around 3 per share, an increase of more than 7 percent from yesterday’s close of 2. That’s up more than 94 percent from where it was to start the year.

Amazon’s Simple Notification Service also got a boost with a new Time to Live feature for mobile push notifications. Now, a developer can send a push notification to customers during a particular time window up to two weeks in length. That means a customer won’t have to get a notification for an event that has already happened while SNS couldn’t reach their phone.