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Pit your wits against the combined brain power of the Naked Scientists, in this question and answer Special as the team try to find out the truth behind the age of the Milky Way? Whether plants die of old age, and how cats make their fur stand on end? Plus, in the news, contagious yawns, and how the number of takeaways on the way to work affects your risk of weight gain...

With climate change expected to bring more bouts of extreme weather and longer periods of drought and flooding, this week we take a look at ways to turn the tide on the looming water crisis. Plus, in the news, the schoolboy who's become the youngest person yet to achieve nuclear fusion, the pedicure-inspired tags which are helping track turtles, the new gene therapy breakthrough for treating HIV and, what's worse for you, cigarettes, or sausages?

Robots are under examination this week. Engineer Blaise Thomson, from Vocal IQ, designs speech systems for smartphones, Neil Bargh builds robots for science labs, and Airbus systems engineer Paul Meacham, who is building the next rover that will explore Mars, join Chris Smith, Dave Ansell and Ginny Smith to pit their wits against the assembled Cambridge public, answering questions like how would the Mars rover fare in Robot Wars? Plus, we make a motor from scratch and find out what happens when we dunk electronic devices in liquid nitrogen...

Norovirus, the winter vomiting bug, affects 1 million people each year in the UK. But what is it, and how can you best protect yourself? Plus, in the news, how stress hormones depress the stock market, brain training that can improve vision on the baseball field, a new biological marker to diagnose those at risk of depression and artificial growth factors to speed up wound healing...

Should you raise your baby to be bilingual? Are video games rotting or rejuvenating children's brains? We find out! Plus in the news, personalised breast milk, modelling the brain with computers, how crude oil spills affect tuna and the next step towards nuclear fusion.

UK Universities and Science Minister, David Willetts, becomes his own radio presenter; here, on a tour organised by the UK's Science and Innovation Network, he charts his meetings with scientists and entrepreneurs in Chicago, including discovering how researchers are trying to develop new batteries, he meets MIRA the Argonne supercomputer, attends a synthetic biology convention, talks to technology start-up CEOs, addresses the AAAS fellows forum and talks in depth to his travelling companions, Nottingham chemist Martyn Poliakoff and Edinburgh Vice Prinicipal Mary Bownes...

Do scientists resort to propaganda to defend climate change? How do we deal with evolution unbelievers? How do governments and policy-makers decide what science should be funded? Where will the next generation of communicators come from? Why are western countries spending more on baldness than malaria? Live at the AAAS 2014 meeting in Chicago, panellists David Willetts, the UK Minister for Universities and Science, Robyn Williams, of the Science Show on the ABC, MIT Enterprise Forum president, Kathleen Kennedy, IgNobel Awards founder Marc Abrahams and University of Madison-Wisconsin scientist Molly Jahn join Chris Smith to answer questions live from the audience...

We're chewing over the topic of food footprints: How green is your lunchbox? What's the environmental impact of your weekly food shop? Plus, in the news, the prosthetic hand that has allowed an amputee to feel for the first time, a new fatal strain of flu has been identified in a patient in China and Gaia's goal is to create the most accurate map yet of the Milky Way.

This week we we zoom in on the subject of nano-particles to examine how tiny objects, smaller than the wavelength of light, can be making such large waves in the fields of health, optics, and electronics. Plus news of purple tomatoes on their way to your dinner plates, the medical treatment that could mean the end of peanut allergies, the acid dip that reverts cells to their stem state, and what's in the air in Beijing?

Live on location at the Cambridge Science Centre, Chris Smith is joined by exercise scientist Dan Gordon, who also holds the world record in tandem cycling, epidemiologist Nita Forouhi, who studies diet, and David Ogilvie, who investigates how our environment can shape our activity. Together they pit their wits against the assembled public as they answer questions like, is watching the Exorcist a replacement for exercise? Plus Dave Ansell and Ginny Smith find the iron on breakfast cereals, measure the vitamin C in carrots, and see how much exercise it takes to work off a Mars bar...