Spectacular aurora captured from space by Russian cosmonaut – video

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More from InDepthDating apps could be in trouble – here's what might take their place

There are two main types of smoke alarm tech, says Raman Chagger, principal consultant at BRE, the Building Research Establishment. Ionisation-based systems use a tiny amount of radioactive material to charge, or ionise, particles in the air which flow between two small plates. Should smoke interrupt that flow of charged particles, the alarm goes off.

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Rubio says

В России ответили на имитирующие высадку на Украине учения НАТО18:04