South Africa braces for shutdown after weeks of anti-migrant unrest. Plus: Nobel Foundation head Hanna Stjärne; planetary defences on Asteroid Day; and Thomas Chatterton Williams on Europe’s air-conditioning plight.

Live from London and Paris: Venezuela denies Machado entry and Monaco suffers rare bomb attack
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The death toll rises in Venezuela after earthquakes
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The world scrambles to help after Venezuela’s worst earthquakes in 100 years
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