In the United States, many children are returning to school after a nearly three-month summer break from classes.
Sierra Leone has quarantined 50 people in the northern area of Kambia.
The World Health Organization reports that hundreds of millions of people have a mental health disorder, but receive little or no treatment.
There is a new celebrity in the United States.
Mosquitoes have an extraordinary ability to target humans far away and fly straight to their unprotected skin.
Every day, people come into contact with thousands of chemicals.
Recently, Indian Prime Minister Narendra Modi launched a campaign on social media.
The number of multi-drug-resistant tuberculosis cases is rising.
Air pollution is the biggest environmental health risk in the world, says the World Health Organization.
The World Health Organization says the use of surgical childbirth is growing worldwide.