A filmed biography of Stephen Hawking was inevitable. A genius of cosmology and quantum gravity, he was one of the rare scientists to have acquired great public notoriety. Knowing moreover with which valor this exceptional being, supported by his loving wife, resisted the ravages of Lou Gehrig's disease, the novelistic side was guaranteed. It resulted in James Marsh's « The Theory of Everything", not an exceedingly original work but quite a satisfying one for all that. It certainly deals only superficially with hard sciences, but could it be otherwise in a work intended for the general public? Inspired by Jane Hawking's book, the screenwriter Anthony McCracken has chosen - and rightly so - the only possible angle, that of the personal story of Stephen and Jane, closely united as they were in their struggle against an adverse fate. Thus considered, this "The Theory of Everything" proves to be as edifying as touching, thanks in particular to its two actors, Eddie Redmayne, amazing in his evocation of the physical deterioration of his character, and Felicity Jones, knowing how to ally the energy of the fighter to the expression of the unconditional love. Overall, not too much pathos, and even some humor. With such a potentially lachrymal subject, the finished product could have been worse, much worse.