<p>That later swelled to a group of 21, was endangered almost immediately after its announcement Thursday evening, after comments Biden made in a news conference on the deal angered Republican senators.</p>

That later swelled to a group of 21, was endangered almost immediately after its announcement Thursday evening, after comments Biden made in a news conference on the deal angered Republican senators.

Remember, it's not an on and off switch Part 8

"Behaviors take time to implement and adopt. They also take time to un-adopt," says Abraar Karan, an internal medicine physician at Brigham and Women's Hospital.

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Remember, it's not an on and off switch Part 8

Remember, it's not an on and off switch Part 8