"If quantum mechanics is right, there is no way to get around the uncertainty principle. The reason that the electron’…"

"At the heart of the quantum revolution is Heisenberg's uncertainty principle... roughly... all physical quantities...…"

"The uncertainty has deep implications. For example, it means that a quantum particle does not move along a well-defin…"

"Relativity principles require us to associate mass with the energy of radiation, and it is reasonable to suppose... a…"

"Suppose... motion of an electron in the absence of a field of force, is to be investigated... by testing the validity…"

"Une loi de Physique possède une certitude beaucoup moins immédiate et beaucoup plus difficile à apprécier qu'une loi …"

"In September 1973, while I was visiting Moscow, I discussed s with two leading Soviet experts, Yakov Zeldovich and Al…"

"[T]he laws of physics need not break down at the origin of the universe. The state of the universe and its contents, …"

"Ultimately... one would hope to find a complete, consistent, unified theory that would include all... partial theorie…"

"It must have been one evening after midnight when I suddenly remembered my conversation with Einstein and particularl…"