Images of a herd of 15 Asian elephants trekking through China's south-western Yunnan province have gone viral on social media and captured the imagination of the world. Neil Cairns talks to Becky Shu Chen, from the IUCN Asia elephant Specialist Group, about why the elephants are making this trek and the challenges of conservation.

And vaccines have been a remarkable success story of the covid 19 pandemic. A range were rolled out in just a year with clinical trial data suggesting very high levels of effectiveness against SARS CoV 2 infection. However, they have a chink in their armour: variants.

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