WE publish this week, as a special supplement, the substance of an address by Prof. N. Bohr on the development of the theory of atomic structure, and in particular of the latest form and tendencies of ...

IN a letter to NATURE (March 11, p. 41) S. C. Bradford stated: “The great objection to Langmuir's theory of atomic structure is the difficulty of accepting his hypothesis of stationary eletrons.” The ...

Edward Witten reflects on the meaning of dualities in physics and math, emergent space-time, and the pursuit of a complete description of nature. Among the brilliant theorists cloistered in the quiet ...

Investopedia contributors come from a range of backgrounds, and over 25 years there have been thousands of expert writers and editors who have contributed. Robert Kelly is managing director of XTS ...