Hundreds of millions of photos and videos flood the Internet every day, a potential gold mine for online businesses that can get people to click on them. But which pictures will draw the biggest crowd and generate the most revenue?

An old federal policy could cause more than 10 million Americans to get a higher Medicare bill next year. A small provision in Medicare’s policy will lead to 15 million Americans facing more than 50 percent increases in their monthly premiums next year.

Beet juice, with its high concentration of nitrates, may help boost muscle strength among heart patients, a small study has found.

Much more is highlighted in A Look Ahead.