The high school students are also calling for anti-gun violence demonstrations on March 24 in Washington, D.C. and other cities.
The United States government and a few American companies have established programs to send astronauts to Mars.
News reports suggest that the Vatican and China could reach an agreement on the appointment of Chinese Catholic religious officials.
The Reverend Billy Graham died Wednesday at his home in the American state of North Carolina, a spokesman said.
The rat and mice studies are not the same as real-life cellphone use.
With 6 Teens Running For Kansas Governor, a Dog Tries, Too.
Florida School Shooting Is One of Deadliest in US History
Osteoarthritis is the most common kind of arthritis.
China Bans Many Imported Recyclable Materials
Parents wait for news.