Alexander Fleming discovered penicillin 90 years ago this month. Since then, antibiotics have saved countless lives, but overusing them puts lives at risk by creating antibiotic-resistant strains of bacteria. Alastair Hay explains why he is optimistic about the future of this precious resource. If antibiotics kill bacteria, then probiotics encourage their growth – the good ones, that is. Ana Valdes looks at new research in the area.

Rainforests can be forbidding places: tangled, dark and full of potential threat. For this reason, it has long been assumed that humans only started living in them fairly recently, after the development of agriculture. But, as Eleanor Scerri explains, new research indicates that hominids may have been living in African rainforests as long as 100,000 years ago – and this could even have contributed to how we evolved.

An anonymous New York Times op-ed by a "senior Trump staffer" has sparked frenzied speculation about the author's identity, and met with furious criticism from the president himself, who accused whoever wrote it of "treason". Andre Spicer has some advice for political staffers saddled with unmanageable bosses.

And the UK government has named two Russians as prime suspects in the Skripal case. Dan Lomas reports that their apparently brazen approach suggests Russian state-led intelligence services do not seem to care whether they are discovered or not.

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