Focus on Africa - European Leaders Continue Charm Offensive in Africa

Two of Europe's most powerful leaders continue setting out their stalls in separate African visits - Kenya and Ghana state their wants; Nigeria's defence minister on his country's security crisis; Soweto in South Africa after the latest anti-immigrant attacks; and the fishermen staying safe at sea with the help of condoms.

CrowdScience - Is there life on Mars?

It’s the central question for the current generation of Mars missions. Since the first close-up pictures of the red planet back in 1965, decades of space missions have revealed our neighbouring planet to be cold, rocky and sterile. But there are hints of a more dramatic past; of raging volcanoes and flash floods. Could this be a planet where life existed? Could life still exist under the surface? And could humans live there, or even travel the distance to get there safely, at some point in the coming decades?

CrowdScience listeners from Australia, Ghana and Canada have been musing on all sorts of Martian matters. Presenter Marnie Chesterton visits a corner of Stevenage, UK, with a distinctly unearthly appearance and takes a virtual tour of the Martian atmosphere. She also puts listeners’ questions to the scientists designing the spacecraft and instruments they hope will unlock the secrets of Mars.

(Image: illustration of Mars shot from space. Credit: Getty Images)

CrowdScience - Could humans live in underwater cities?

The idea of creating underwater habitats has captured the imagination of writers, thinkers and scientists for decades. However, despite numerous grand visions, these dreams of aquatic metropolises have not yet come to fruition. Crowdscience listener and scuba enthusiast Jack wonders whether - given improved technology and the growing environmental pressures facing humans on land - it is time to reconsider the ocean as an alternative permanent living space for humans.

Marnie Chesterton dons her flippers for Crowdscience in search of the oceanographers and architects who have dedicated their lives to designing vessels, labs and underwater habitats. She explores whether oceanic cities remain a sci-fi dream or a realistic solution to some of our modern challenges. Can the oceans’ largely unexplored resources be harnessed to support living underwater?

(Photo: Illustration of a modern city under the sea. Credit: Getty Images)

CrowdScience - Can we trap light in a box?

What is light and can we trap it in a box? On this edition of CrowdScience, Marnie Chesterton brings you a kaleidoscope of colourful questions from listeners around the world, from Kampala to Chicago. Shireen asks why people have a favourite colour and whether other animals show colour preferences too. Marnie heads to the zoo to see what the birds, bees and butterflies think. There, she meets a colour-changing chameleon to find out how and why it does because of a question from Dramadri in Uganda.

Meanwhile, Paul in Melbourne is interested to know more about colour blindness. And finally, Feroze asks why we only see a portion of the electromagnetic spectrum and wants to know if we might, one day, hack our vision to see beyond the seven colours of the rainbow.

Presenter: Marnie Chesterton Producer: Graihagh Jackson

(Photo: Stardust and magic in a woman hands on a dark background. Credit: Getty Images)

World Book Club - Hilary Mantel: Bring Up the Bodies

This month’s World Book Club broadcasts from the Man Booker 50 Festival at the Southbank Centre, celebrating the 50th anniversary of the renowned prize. In the World Book Club chair is the double-Booker prize-winning British writer Hilary Mantel discussing the second volume in her acclaimed series of novels about Thomas Cromwell. Bring Up the Bodies delves into the heart of Tudor history and the downfall of Queen Anne Boleyn whom King Henry VIII had battled for seven years to marry.

CrowdScience - How Do You Stop a Hedgehog Invasion?

Hedgehogs are the UK’s favourite British mammal. They have cute furry faces, a snuffly nose and the ability to gobble up garden slugs. What’s not to like? Answer: quite a lot if you live in the Outer Hebrides. Hedgehogs were introduced to South Uist in the 1970s as garden pest controllers, but are now serious pests in their own right – munching their way through the eggs and chicks of globally important wading bird populations. This emblem of cuteness is really a killer. So what’s to be done?

That’s the quandary facing this week’s CrowdScience thanks to a question from Juan Carlos in Cuba. He wants to know how different parts of the world are dealing with invasive species – one of the biggest threats to global biodiversity. Presenter Anand Jagatia heads to the Uists to hear how having an invader that’s loved by millions can cause a whole host of problems. He also discovers how various warring parties eventually came together to solve this very prickly problem.

Also in the programme, Anand travels to South Africa to find out how researchers are coping with invasive trees by introducing another non-native species. While in the Caribbean, we hear how people are dealing with invasive fish by eating them.

Presenter: Anand Jagatia Producer: Anna Lacey

(Photo: A European hedgehog. Credit: Getty Images)