Israel’s Cease-Fires in Lebanon and Gaza Appear Fragile Israeli forces killed at least 15 people and injured dozens more in southern Lebanon on Sunday, Lebanese officials said. In Gaza, Israel ...

The isolation of influenza virus 80 years ago in 1933 very quickly led to the development of the first generation of live-attenuated vaccines. The first inactivated influenza vaccine was ...

The first humans to land in North America are believed to have been settlers from Russia who crossed the Bering Strait to reach the west-lying land. Previous hypotheses suggested that this took place ...