Where did all our water come from? For 40 years, scientists have been toying with the idea that Earth’s water arrived on comets and asteroids. But recent evidence suggests an alternative. Balz Kamber explains why there’s increasing belief that water formed in the molten rocks of the Earth’s mantle and was gradually released through a fiery landscape of volcanoes.

Often when politicians are caught being less than truthful they will say that they "misspoke", hoping it will give the impression they are guilty of a lesser offence than lying. Former US secretary of state, Hillary Clinton, and US attorney-general, Jeff Sessions, have both owned up to this. But John Olsson claims misspeaking is simply lying about telling a lie.

American cartoonist Will Eisner was born 100 years ago, and to commemorate him several major exhibitions of his work are planned. But his most significant legacy, argues Jean-Matthieu Méon, was in the popularisation of the now ubiquitous term "graphic novel". Although it was coined in 1964, it was Eisner's work in the 70s that cemented the idea of the graphic novel as something literary, and worthy of serious critical attention.

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