When it comes to speed, humans have got nothing on cheetahs - or greyhounds, kangaroos or zebras for that matter. It’s over long distances we really come into our own: when running for hours or even days, our body structure and excellent sweating skills make us able to outpace much faster mammals.

But what are the limits of human endurance? Can we run ever further and faster, and what’s the best diet to fuel such ambitions?

This week’s questions come from two CrowdScience listeners in Japan who already know a fair bit about stamina, having run several marathons and long-distance triathlons between them. We head to Greece, legendary birthplace of the marathon, to witness an even more arduous challenge: hundreds of athletes following in the footsteps of the ancient Greek messenger Pheidippides, to run an astonishing 246km across the country. The ever-so-slightly less fit CrowdScience team do our best to keep up, and try to discover the secrets of these runners’ incredible endurance.

Presenter: Marnie Chesterton

Producer: Cathy Edwards

(Photo: a runner in the Spartathlon ultramarathon, with kind permission from the International Spartathlon Association)

Would you willingly break a mirror, walk under a ladder or cut up an image of someone you love - or might you be worried about tempting fate – even if you don’t believe in supernatural forces?

Anand Jagatia enters the world of magical thinking on behalf of CrowdScience listeners to explore why - even in this era of scientific rationalism – superstition, magic and belief in concepts like the evil eye and luck appear deeply entrenched in our cultures and psyche.

Meeting historians and psychologists, Anand sets out to reveal the enduring lure of superstition and explore the biological factors that can influence us, like how our brains have evolved to look for connections and find patterns in seemingly random events.

Is it possible that some people are ‘lucky’ and can we enhance our own ‘luck’? Experimental evidence is thin on the ground but finger’s crossed, CrowdScience can find some.

Presenter: Anand Jagatia

Producer: Melanie Brown

(Image: A handmade Voodoo Doll with pins. Getty Images)

As the US reaches the end of another hurricane season listener Kelly wants to know if it’s possible to prevent these devastating storms? She lives in Florida, the hurricane capital of the world, and has survived 100mph winds whipping through her home. But could science hold the solution to these extreme weather events?

Marnie Chesterton had the unique opportunity to fly into hurricane Florence with the weather scientists gathering data that helped forecasters predict its path, and reports from on board a plane near the eye of the storm. She hears from one researcher who wants to ‘whiten’ clouds to lower sea temperatures and reduce hurricane formation but learns others fear interventions like this could have unintended consequences elsewhere.

Presenter: Marnie Chesterton

Producer: Marijke Peters

(Photo: Hurricane between Florida and Cuba. Credit to: NASA and Getty Images)

As the show that takes your questions and turns them into audio adventures reaches its 100th episode, Marnie Chesterton revisits a few of our most liked, talked-about, and inbox-filling programmes to find out how science is getting on with the answers. Marnie heads to a place where important queries have been tackled for hundreds of years - the University of Cambridge in the UK - to chase down some burning follow-ups on topics that have piqued your interest. She finds out what the future holds for the next generation of batteries as they're expected to power everything from smart phones to your car and even your house. Then she scrubs up to tackle your tough questions on the best ways to keep clean.

Finally, Marnie visits a memory laboratory at Cambridge University to discover whether the very process of asking questions might be one way to help us remember more.

(Photo: A woman from a group raises her hand to ask a question. Credit: Getty Images)

This violent and repetitive involuntary constriction of the chest muscles is highly infectious, and can result in convulsions, profuse tears and a reddening of the face. People are known to clutch their chests or roll around on the floor during the more intense bouts. Buy why? It seems a particularly odd thing to do and that’s why CrowdScientists, Erin from Australia, Geraldine from Switzerland, and Musweu from Zambia wanted to find out more about laughter. In pursuit of an understanding of what laughter is, and why we do it, Geoff Marsh attempts to distinguish the sounds of friends from strangers laughing together, and explores the earliest origins of this rib-rending behaviour. In the process he discovers that we’re not alone in laughing, and uncovers the importance of this ability for making and maintaining friendships.

Presenter: Geoff Marsh

Producer: Rory Galloway

(Photo: Two young girls eating an ice-cream and Laughing. Credit: Getty Images)

E-cigarettes and vaping may only have been around for a decade or so but it's estimated more than 35 million people globally have taken it up. Marnie Chesterton heads to a vape show to discover why these gadgets are proving so popular, and hears from one expert who warns they could be damaging lung immune cells. She examines the research behind claims that e-cigarettes can help smokers quit, and finds conflicting evidence about how good they are at giving people the nicotine hit they crave. It's a research field that's in its infancy and with vaping technology constantly changing, it's little wonder some scientists say it's a struggle to keep up.

Presenter: Marnie Chesterton

Presenter: Marijke Peters

(Photo: A woman smoking an e-cigarette. Credit: Getty Images)

Have you ever been out driving and noticed your mind… wandering? CrowdScience listener Sian Gardiner has. When travelling to visit her parents she has to cross a very large, very obvious bridge. But there are times when she finds herself on the other side with no memory of having gone over it. How is that even possible?

Presenter Geoff Marsh buckles up to find out. He travels through the science of how driving becomes second nature, brakes sharply when he realises he’s not necessarily in conscious control at 70mph, and tries to refocus when he discovers why drivers don’t always see things that are staring them in the face. He also asks what’s happening when our mind drifts away from the road, and what can be done to help drivers pay more attention and reduce accidents.

Presenter: Geoff Marsh

Producer: Anna Lacey

Sound design: Peregrine Andrews

(Photo: A woman sits in her car, looking through window glass with rain drops. Credit: Getty Images)

In humans if you have two X chromosomes you are female and if you have an X and a Y then you are male. It is textbook science. But CrowdScience listener Du in Singapore has done some extra homework and found a piece of intriguing fish research which suggests a different outcome, at least for one species – tilapia, a popular fish on restaurant menus worldwide and as it happens, the first fish to visit space. Whilst humans couldn’t exist without an X-chromosome, tilapia apparently, can. In fact, they are happy with just two Y chromosomes. The existence of this odd breed comes down to the tilapia fish’s ability to change from male to female.

Nature has come up with an array of bizarre solutions when it comes to sex determination and what sets you on one genetic path or another. And like with the tilapia fish, the decision isn't always for life. Some species of fish, lizards and even birds sidestep the chromosome system and morph between the sexes to survive a changing environment. How can they have both genetic sex pathways latent within them? And why can’t humans do the same trick?

Presenter: Marnie Chesterton

Producer: Louisa Field

(Photo: A male Asian sheepshead wrasse courting a female featured in BBC’s Blue Planet II. Credit: Getty Images)

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)

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)