When British explorer George Mallory first entered the spectacular – and, to some, sacred – Kama valley in the shadow of Mount Everest, he was struck by its effect on his expedition party. He wrote that the grumblings of his previously stubborn porters suddenly transformed into “great friendliness” and “splendid marching” – such that they were “undepressed with the gloomy circumstance of again encamping in the rain”.

Exactly a century after Mallory disappeared while he and Sandy Irvine were making their bid to reach the top of the world, Carl Cater used photos from these early British expeditions to see how different the Tibet-side of Everest looks now – in part because of the effects of climate change. You can judge for yourself in our latest Insights long read, using the “slider” then-and-now images. But during this trip, Cater also witnessed China’s extraordinary boom in high-mountain tourism, as tourists flock to Everest on tarmacked roads lined with souvenir shops and mobile coffee baristas.

A rise in so-called “Ozempic babies” has led the UK’s medicines regulator to issue guidance on use of weightloss drugs by women of reproductive age. Our expert explains how these drugs might affect how well oral contraceptives work.

And here’s an unmissable article on how ancient flying pterosaurs could influence designs for aircraft of the future – despite having been extinct for 66 million years.