The Gaza Strip's Rafah border crossing with Egypt has been a key lifeline for people in the Palestinian enclave. Here is a timeline of events since Oct. 7, 2023, leading up to Israel's offensive.

Three years ago, the novel coronavirus swept the world. Here are 24 quotes and 13 photos that sum up the reaction in the weeks before the World Health Organization's declaration of a global pandemic.

The first vaccine required for school was for smallpox, over 200 years ago. And for decades, all states have required that kids be vaccinated against contagious diseases like polio to attend school.