CrowdScience - Why do we pull faces when we concentrate?

Do you stick your tongue out or scowl when you concentrate? Maybe, like one of our listeners, you screw up your face when you’re playing music. Do these facial expressions actually help with the task in hand? And could they hold clues to humans’ evolutionary past? In this edition of CrowdScience we tackle the science of face-pulling, along with several more burning science questions sent in from listeners around the world. We explore why it’s almost impossible to talk without moving your hands; and why bilingual people often switch to the first language they learned when they’re counting, even if they speak another language the rest of the time.

Presented by Anand Jagatia and Marnie Chesterton Produced by Cathy Edwards

(Photo: A boy sits at a table, looking down in concentration as he draws in a note pad. Credit: Getty Images)

Science In Action - The human danger – for sharks

A global project tracking sharks through the deep oceans has found they are increasingly facing danger from fishing fleets. Sharks used to be caught accidentally, but now there is a well-established trade in shark meat and fins, which the researchers say is reducing their numbers.

We look at how tourists might be a useful source for conservation data, And we meet one of the planets smallest predators, is it a plant is it an animal? Well actually it’s a bit of both.

(Photo: Tiger shark. Credit: Barcroft Media via Getty Images)

Presenter: Roland Pease Producer: Julian siddle

30 Animals That Made Us Smarter - Whale and wind turbine

The shape of flippers may help with the efficiency of wind turbines, thanks to humpback whales. Bumps on the edge of their flippers assist them, as they power through water. Biologist Frank Fish discovered this when he saw a sculpture. With Patrick Aryee. For more information and animations: www.bbcworldservice.com/30animals Please leave rating and reviews and help us to spread the word. #30Animals

CrowdScience - Where’s my time machine?

Laser swords, time machines, matter transporters - before the turn of the millennium, movies, books and television promised some extraordinary future technology. Now we’re twenty years into the next century and CrowdScience listeners are wondering: Where is it all?

Marnie Chesterton delves into the sci-fi cupboard to dust off some imaginary gadgets and find out if any are finally becoming reality. How far into the future will we have to go to find a time machine as imagined by H.G. Wells in 1895? Where are the lightsabers wielded by fictional Jedi? Why are we still using cars, planes and trains when a matter transporter or a flying taxi could be so much more convenient? Marnie is joined by a panel of experts to find out if and when any of these much-longed for items are going to arrive.

Presenter Marnie Chesterton. Producer Jennifer Whyntie

(Photo: Dr Who, Tardis. Travelling through time and space. Credit: BBC Copyright)

Science In Action - The moon landing and another big space anniversary

It’s 50 years since the moon landing and 25 years since Shoemaker - Levy 9 crashed into Jupiter. The Apollo missions returned to earth with cargos of moon rocks and the comet crash showed us what happens when celestial bodies collide.

We look at the significance of both this week, and also contemplate a return to the moon. What will the next generation of moonwalking astronauts do there?

One thing’s for sure, they’ll be examining moon rocks once more – though this time with a range of scientific tools which hadn’t been invented when the Apollo missions ceased.

Picture: Shoemaker – Levy 9 Comet Impact Marks on Jupiter Credit: Getty Images

Presenter: Roland Pease Producer: Julian Siddle