LEDs are broadband by nature, since the spontaneous emission broadly speaking reflects the overlap of the Fermi distribution and the density of states

it is not specifically about schooling but about the upbringing of a rich man’s son, Émile, by a tutor who is given unlimited authority over him. Rousseau’s aim throughout Émile is to show how a natural education, unlike the artificial and formal education of society, enables Émile to become social, moral, and rational while remaining true to his original nature

He learns a trade, among other things. He studies science, not by receiving instruction in its facts but by making the instruments necessary to solve scientific problems of a practical sort.

I do not consider these laughable establishments called Colleges as a public institution.

There are in several schools, and especially in the University of Paris, Professors whom I like, whom I esteem very much, and whom I believe very capable of instructing young people well, if they were not forced to follow established usage. I urge one of them to publish the reform project he designed. We will perhaps finally be tempted to cure the illness by seeing that it is not without a remedy.

Je n’envisage pas comme une institution publique ces risibles établissements qu’on appelle Colleges

Il y a dans plusieurs écoles, & surtout dans l’Université de Paris, des Professeurs que j’aime, que j’estime beaucoup, & que je crois très capables de bien instruire la jeunesse, s’ils n’étoient forcés de suivre l’usage établi. J’exhorte l’un d’entre eux à publier le projet de réforme qu’il a conçu. L’on sera peut-être enfin tenté de guérir le mal en voyant qu’il n’est pas sans remède.