By Christine Chung The deadly crash of a sightseeing helicopter in New York City on April 10 has left many people wondering about the safety of such tours. Commercial sightseeing helicopters take ...

Samarkand, once a bustling hub on the Silk Road, was also an epicentre of scientific discovery. In the 15th century, Ulugh Beg, a Timurid ruler and astronomer, built an advanced observatory where ...