Why do humans uniquely have a chin, for example? And why, relative to body weight, is a human testicle triple the size of a gorilla’s but a fifth of that of a chimpanzee?

In a recent survey from The Ohio State University Comprehensive Cancer Center, only 13% of adults said testicular cancer is most common among men aged younger than 40 years. However, testicular ...

Lumps in the testicle can be a sign of an underlying condition such as testicular torsion and testicular cancer. Learn more here.

It was thanks to the multiple observations provided by convergent evolution that we were able to discover this consistent correlation between testicle size and sex life right across the mammals. And ...

Analysis - The human body is a machine whose many parts - from the microscopic details of our cells to our limbs, eyes, liver and brain - have been assembled in fits and starts over the 4 billion ...

Testicular cancer articles from across Nature Portfolio Testicular cancer is a cancer that starts in the testis. The majority (95%) of testicular cancers are germ cell tumours. Treatment for ...

Jiri Prochazka knows fighting a gorilla without preparation is all about survival, which is why he’s going straight for the softest targets.

Find out what you need to know about scrotoplasty, and discover the pros, cons, risks, and benefits, and how it may affect health.