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In the second lesson, we examined how electron fluid screens the charge of individual electrons and arrived at the notion of quasi-particles, low-energy fermionic excitations of electron fluid that obey the Pauli exclusion principle and carry a transverse …

A Collège de France - CNED coproduction Abstract " Economic science focuses on the creation of material wealth, a field where "action is not always the sister of dreams", to quote the poet once more. It is part of a disenchantment of the world, the kind …

Abstract The first lesson began with a reminder of the difference between universal constants, such as the quantum of action (Planck's constant) and the quantum of charge, and microscopic constants, such as the mass of the electron and proton. We also …

A Collège de France -   CNED coproduction Abstract " This brief exchange is part of the golden legend of our discipline. It took place, seventy-eight years ago in one month's time, on the afternoon of Sunday, November 26 1922, on one of those luminous …

Abstract Because of their large number of atoms, macroscopic systems can easily be assembled from independent parts, like clocks and their cogs. Quantum systems, on the other hand, have properties that make them naturally regular and resistant to noise, …