Portfolio: The nature detectives

Imagine standing on the surface of the Moon, staring back at Earth and having in your grasp a device that allows you to see a tennis ball.

Maureen Dunlop

Further to your obituary of Maureen Popp, née Dunlop (11 June), as a close friend of Maureen – and, like her, a former pilot – I was honoured to be asked to escort her to an investiture meeting of the Guild of Air Pilots, writes Richard Gregory.

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GM mosquitoes deployed to control Asia's dengue fever

A genetically modified mosquito carrying an artificial fragment of DNA designed to curb the insect's fertility has been released for the first time in south-east Asia as part of an ambitious attempt to combat deadly dengue fever that affects up to 100 million people worldwide.