In sofa as I can recall: troubles for Cyril Ramaphosa

South Africa’s leader says a pile of cash stashed in a sofa represents no wrongdoing. The outcome of an investigation could be the undoing of his presidency and his party. We examine Britain’s hydrogen-economy plans as representing the tradeoffs that many countries will face. And remembering Jay Pasachoff, the world’s foremost expert on and exponent of eclipses.

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