Amazon Spikes Prime Cost to $119, and Dark Chocolate Can Help With Stress and Memory. 3 Things to Know Today. Stay in the know in 60 seconds.

By Hayden Field

Amazon more than doubled its quarterly net profit and plans to raise the cost of annual Prime membership by 20 percent, making the new price $119.

In other news: If you're feeling stressed or having memory trouble, dark chocolate with a cacao concentration of more than 70 percent might help, according to two new studies.

And if you're heading to see the new Avengers this weekend, you're not alone. Estimates indicate the film could bring in up to $540 million worldwide.

Hayden Field

Entrepreneur Staff

Associate Editor

Hayden Field is an associate editor at Entrepreneur. She covers technology, business and science. Her work has also appeared in Fortune Magazine, Mashable, Refinery29 and others. 

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