A new report says the number of people over the age of 60 is expected to double by the year 2050.
The Dalai Lama entered the Mayo Clinic in the American state of Minnesota earlier this week.
China is among those governments that have banned single women from freezing their eggs for future use.
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.