Axios

The stock market entered correction territory (when stocks fall 10% or more from a recent market high) for a few minutes today, plummeting 1,500 points before rebounding slightly to a 1,175 point loss on the day.

Why it matters: Between today and Friday's 666 point drop, the market has erased its 2018 gains.

Lululemon CEO Laurent Potdevin resigned suddenly Monday. The athletic clothing retailer said in a statement that he "fell short" of its "standards of conduct."

"While this was a difficult and considered decision, the Board thanks Laurent for his work in strengthening the company and positioning it for the future. Culture is at the core of Lululemon, and it is the responsibility of leaders to set the right tone in our organization. Protecting the organization's culture is one of the Board's most important duties."

Facebook is looking to open up its "Watch" video platform to more individual creators, influencers and brands, CNBC reports. 
Why it matters: It's a step towards making its video platform look more like YouTube than television, with less episodic, vetted content and more authentic, accessible content at scale. 

Newsweek has fired its Editor-in-Chief Bob Roe and Executive Editor Ken Li, as well as two reporters and an editor at the International Business Times, per The Daily Beast.

The details: The company did not tell staffers why it fired the four staffers. But The Daily Beast reported that three employees spoke on the condition of anonymity saying four of the staffers had recently published stories about the company’s woes, which include a raid of Newsweek's New York offices by the Manhattan district attorney.

The fight between hospital chain Tenet Healthcare and hedge fund Glenview Capital Management has intensified, and Glenview has made it clear it wants to push out four of Tenet's board members.

The bottom line: Glenview, led by billionaire Larry Robbins, owns almost 18% of Tenet and has the power to rally for bigger, quicker changes. The firm most recently took direct shots at Tenet's "chronically underperforming" finances and "shareholder-unfriendly" practices.

MassMutual will run a two-minute Super Bowl ad before kickoff this year, specifically to capture the somber tone that comes with the Super Bowl's pre-game rituals.

Why it matters: While most advertisements are getting shorter (such as ads less than 10-seconds online) some advertisers are bucking the trend to bring culturally relevant messages to sports, particularly high-impact games, given the political climate around issues of diversity, race and harassment.