What were Niels Bohr's two middle names?

Niels Bohr’s two middle names were Henrik David.

His full birth name was Niels Henrik David Bohr. “Henrik” and “David” sit between his given name, Niels, and his family name, Bohr, making them his two middle names in the wording used by this quiz.

Bohr was born in Copenhagen on 7 October 1885. His father, Christian Bohr, was a professor of physiology, and his mother was Ellen Adler. The family also included his younger brother Harald, who became a distinguished mathematician and footballer.

The names can be confused with those of Bohr’s relatives and colleagues. Aage was the name of Bohr’s son who later won the Nobel Prize in Physics, while Harald was his brother’s name. Niels himself received the 1922 Nobel Prize for his work on atomic structure and radiation.