The immune system protects you without you even knowing it. Its army of white blood cells battle against viruses, bacteria and other foreign invaders that threaten your health. But those white blood ...

Add Yahoo as a preferred source to see more of our stories on Google. Law professor Leah Litman and political science professor Corey Brettschneider join Chris Hayes to discuss the fallout of the ...

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At every moment of its existence, the human body is locked in a life-and-death struggle for survival. The enemies are silent, unseen and everywhere around us. Viruses and bacteria swarm in the world ...

Hear from Republican voters about how Trump’s conviction on 34 criminal charges impacts their thoughts on the upcoming election ...

Health experts are reporting an uptick in COVID cases and upper respiratory viruses. They are also seeing some colds and strep throat as we head farther into the fall season. What can you do to stay ...