Ariana Eunjung Cha

This is John Zhang, the Chinese-born, British-educated founder and medical director of a Manhattan fertility center that is blowing up the way humans reproduce. In 2009, Zhang helped a 49-year-old...

Over the past two decades, U.S. parents and teachers have reported epidemic levels of children with trouble focusing, impulsive behavior and so much energy that they are bouncing off walls....

A month ago, an international team of researchers announced that they had used a gene-editing technique to safely erase a heritable heart condition from a human embryo. This blockbuster news...

The one rule about antibiotics that has been drilled into our heads for generations is that you absolutely must take the full course - or else something very bad might...

Scientists, public health experts and volunteers working with them have started to show up at music festivals, concerts, raves and other public gatherings where illicit drugs are frequently used. Equipped...

The adolescent years are when people's bodies are supposed to start the ascent to their physical peak. Teenagers are growing like beanstalks. Their hormones are raging. They're eager for new...

American teens may be becoming more conservative about sex. According to a new Centers for Disease Control and Prevention report reflecting data from 2011 to 2015, about 42 percent of...