Figure 1 Pierre‐Gilles de Gennes discussing with André Guinier after the defence of a thesis in the Laboratoire de Physique des Solides in Orsay. (Photograph taken in 1973 by M. Saint‐Martin.)
Figure 2 Two pages of calculation brought by de Gennes the day after his visit to the laboratory. He offered to us the explanation of roll instabilities in a nematic layer subject to shear flow.
Figure 3 M13– a globular cluster clearly visible in Mai.
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