Influenza viruses kill up to 646,000 people worldwide every year.
When men were men and sodas were cocaine-laced nerve tonics.
Air: It's one of the world's most important, least understood, and possibly life-saving substances
We've rounded up 2014's most mind-blowing images for your viewing pleasure
What do ghosts and yawns have in common? They remain scientific enigmas.
A cautionary tale about the limitations of big data
The flu knows how long it has to invade our cells and spread to other humans. So new treatments could fight the virus by resetting its clock.
If 5,000 birds die in a forest and no one is around to find them, does it still become a media sensation?
The Big Question: How many people will it infect this year?
Mexico returns to normal while other countries grapple with the spread of the disease. Plus, a flu blog roundup
H1N1's family tree, the first analysis of the virus, and safety tips from a guy in a gorilla costume
A bold plan to immunize every American against bird fluâ€”in four weeks
An illustrated explanation of why the world's most obnoxious virus at least doesn't stick around all year.
Also, human trials on H1N1 vaccine to start, worries about countries hoarding vaccine, and other influenza news
When vaccine shortages strike, a way to use small amounts more efficiently may be the answer
Winter is coming.
As the CDC announces the first U.S. death from the swine flu, media outlets wrestle with how to cover the outbreak