Opponents charge that Mr Chavez's constant harangues are aimed at encouraging such attacks.

ECONOMIST: Venezuela's stand-off

His big idea: constant, renewable power can charge a phone and change the world.

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Paradoxically, when we put in schemes to control our food intake or attempt to change our shape, we can think that we are taking charge and we gain some short-term relief from the constant judgmental noises inside our heads.

BBC: Interactive Essay: Transcript

His main characters include G, the strength of gravity, h, Planck's constant, which governs the quantum nature of reality at small scales, e, the charge of the electron, and c, the speed of light itself.

ECONOMIST: Modern physics