Ann Arbor: What makes a person bipolar, prone to manic highs and deep, depressed lows? Why does bipolar disorder run so strongly in families, even though no single gene is to blame?

California: Researchers at the University of California, San Diego School of Medicine have discovered impaired neuronal activity in the parts of the brain associated with anticipatory functioning among occasional 18- to 24-year-old users of stimulant drugs, such as cocaine, amphetamines and prescription drugs such as Adderall.

Ann Arbor: Four years after being treated for breast cancer, a quarter of survivors say they are worse off financially, at least partly because of their treatment, according to a new study led by University of Michigan Comprehensive Cancer Center researchers.

New Delhi: The World Health Organisation (WHO) presented official certification to India for its 'Polio Free' status. (Read In Hindi: भारत हुआ पोलियो मुक्त, गुलाब नबी आजाद ने ग्रहण किया प्रमाण पत्र)

Montreal: A research team of the University of Montreal Hospital Centre and the university’s Department of Microbiology and Immunology has found that HIV-resistant sex workers in Africa have a weak inflammatory response in their vaginas – a surprise for the researchers, who were expecting the contrary considering the women’s high exposure to the virus.

Washington: Reaching for that sleeping pill or drinking alcohol may not be the most effective way for people with insomnia to get better sleep at night in the long run, suggests a new study by Ryerson University experts.