In the United States, an estimated 645,000 men ages 20 to 50 have azoospermia, a condition in which no sperm are present in their ejaculate. Now, scientists are testing a potential treatment: ...

In the early 2000s, dental clinician and stem cell researcher Songtao Shi’s six-year-old daughter lost her first tooth. Curious, Shi, then at the University of Pennsylvania, took a closer look at its ...

Scientists are exploring ways to mimic the origins of human life without two fundamental components: sperm and egg. They are coaxing clusters of stem cells – programmable cells that can transform into ...

Megan Molteni reports on discoveries from the frontiers of genomic medicine, neuroscience, and reproductive tech. She joined STAT in 2021 after covering health and science at WIRED. You can reach ...

In the highly politicized landscape of reproductive health, where science intersects with innate human desire, few figures embody the tension between innovation and caution as vividly as Dr. Zaher ...

Most people have heard of stem cells. They are often described as "miracle" cells –ones that can grow into any other type of cell in our bodies, promising revolutionary medical treatments. However, ...