All over the globe, and maybe somewhere out in space, students are revising - or maybe in a few cases 'vising'. We asked our maths undergraduates how they went about it.

Spoiler alert: this remains an open problem.

A clip from James Maynard's Sophie Germain Oxford Mathematics Public Lecture, one of five talks celebrating Sophie's life, work and influence held at the Royal Institution on 1 April, Sophie's 250th. You can watch all five talks - our own Lukas Brantner, Ana Caraiani, Laura Monk and a Chladni figures demonstration by Dan Plane as well as James - here

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