Episode

Science in Action

BBC World Service

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Technology 39

The latest science research and news stories from all over the world.

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Hacking Zika transmission

February 25th, 2016

Episode 80 of 126 episodes

The Zika virus continues to be a global health concern and research is underway to find means to control mosquito populations – the main mode of transmission for the disease. Scientists have now developed a way of controlling insect populations that could also be used to tackle Zika. Using bacteria that have co-evolved with disease-bearing insects over thousands of years, researchers have managed to reduce insect fertility and even kill larvae. The technique used microbes found in the insect’s gut as a kind of Trojan horse, introducing RNA molecules into the animal which in turn switch off certain genes – in this case either those associated with fertility or with growth in larvae. Unlike chemical pesticides, this approach does not cause environmental damage, health risks to humans and insects do not develop resistance. Professor Paul Dyson from the University of Swansea is one of the lead authors of the study and has just returned from Brazil. The Earth’s rarest minerals More than half of all known mineral species are found in no more than five places on Earth. The global supply of many of these minerals would fit on the tip of a finger. Acetamite, fingerite and swedenborgite are just a few of the minerals that have just been categorised in a paper about to be published in the journal American Mineralogist. While they make up a very small portion of the Earth’s mass, the authors claim that rare minerals can tell us a lot about the construction of our planet. BBC Science Correspondent John Amos has spoken to Dr Robert Hazen, one of the authors of the paper who also had a mineral named after him. Gorillas hum while eating The great apes have been found to sing or hum while they eat. This may be an expression of them enjoying their food – especially in adult males. The fireball nobody saw The biggest space rock since the explosion near Chelyabinsk in 2013 has burned up over the Atlantic on 6 February, releasing energy equivalent to 13,000 tonnes of TNT. Fast radio burst Scientists have tracked a ‘fast radio burst’ back to its source. What causes the flashes of radio waves is unknown – but this particular one came from a galaxy six billion light-years away. Humanoid robot stands up to bullies Robotics company Boston Dynamics has released a new improved version of the Atlas robot. It can walk in the snow, lift boxes and will not be deterred by human bullies. Cockroaches inspire search and rescue robot Cockroaches are not the most popular of insects and most people prefer not seeing them scuttling around their homes. However, the way they scuttle makes them extremely interesting for science. Researchers at Berkeley University have been studying the way cockroaches run, jump, crawl and slither for decades and found that the bugs can run at speeds 50 times their body length per second. New research now shows how American cockroaches manage to compress their bodies and squeeze through horizontal crevices that are a fraction of their usual standing height. Professor Robert Full tells us how a soft, legged robot inspired by the creepy-crawlies might help locate earthquake survivors trapped in rubble. (Photo: Western flower Thrips Swansea University ) Presenter: Jack Stewart Producer: Ania Lichtarowicz Assistant: Jennifer Rieger

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