Editor's note

For a human sperm, the journey to the female egg is a treacherous one and the secret to their swimming prowess has, up until now, remained a mystery. But new research has discovered what it is about their tails that gives human sperm the strength to succeed in the race to fertilise the egg. Hermes Gadelha explains his findings and why they could be a game-changer for the future of IVF.

There has been a massive global revival in craft beer in recent years. But this trend should not simply be of interest to hipsters and microbrewers – anyone interested in the global economy should also take note. Because, according to Maikel Kuijpers, Jochem Kroezen and Catalin Popa, craft principles could help a much-needed transformation of the economy – but not if big business gets its way.

The cyclone that has caused havoc on Africa’s east coast has brought home two very tough realities. First, as Jennifer Fitchett notes, storms are growing in intensity and frequency. And that is exacerbated – as Robert Šakić Trogrlić writes – when countries such as Malawi and its neighbours lack the early warning systems that could protect their citizens from ferocious storms.

All the best.

Holly Squire

Commissioning Editor

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How we solved the mystery of the human sperm tail – and what it could mean for the future of IVF

Hermes Gadelha, University of York

Our new research has discovered what gives human sperm the strength to succeed in the race to fertilise the egg – and it's all to do with their tails.

shutterstock.

Small brewers show how craft principles could reshape the economy – but they’re under threat

Maikel Kuijpers, Leiden University; Catalin Popa, Leiden University; Jochem Kroezen, Cambridge Judge Business School

The practices and values of craftsmanship correspond well with the requirements for a sustainable economy. But they're threatened by industry.

People leaving their homes in the flooded section of Praia Nova, Beira, Mozambique in the wake of tropical cyclone Idai. Denis Onyodi/ IFRC handout

Tropical cyclone Idai: the storm that knew no boundaries

Jennifer Fitchett, University of the Witwatersrand

The recent storms provide a grim reminder of the prospect of future tropical cyclones in a region under continued threat from climate change.

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