Researchers created a mathematical model analyzing combustion waves — from slow flames to supersonic detonation. It yields accurate solutions and explains the transition from deflagration to detonation. The work paves the way for safer engines and improved protection against industrial explosions.

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A series of bilateral health agreements being negotiated between African countries and the administration of President Donald Trump have been labelled “clearly lop-sided” and “immoral” amid growing outrage at US demands, including countries being forced to share biological resources and data.