Stan Wagon, a mathematician at Macalester College in St. Paul, Minn., has a bicycle with square wheels. It’s a weird contraption, but he can ride it perfectly smoothly.

Teenage lesbian or bisexual girls are many times more likely to smoke regularly than straight girls their age. They are the worst hit by tobacco among all groups of young people, according to a new US study.

Embryonic stem cells have been induced to become bone marrow and blood cells in mice using methods that could eliminate the need for genetically matched human bone marrow donors for people with leukemia, autoimmune diseases and other immune disorders.

Scientists are divided about the use of the Moon as a base to develop ways to travel to Mars, according to reports given to the US government.

The highest suicide rate in the world has been reported among young women in South India by a new study. The research is of major importance, according to the World Health Organization, as it brings to light Asia’s suicide problem.