Sergey Petrovich Kapitsa was a Russian physicist and demographer. He was best known as host of the popular and long-running Russian scientific TV show, Evident, but Incredible. His father was the Nobel laureate Soviet-era physicist Pyotr Kapitsa, and his brother was the geographer and Antarctic explorer Andrey Kapitsa.

Pyotr Leonidovich Kapitsa or Peter Kapitza was a leading Soviet physicist and Nobel laureate, whose research focused on low-temperature physics.