CrowdScience

Death is one of life’s few certainties – or is it? To answer listener Pratibha’s question from New Delhi, India, presenter Marnie Chesterton asks medical and scientific experts if there is any evidence that humans could somehow come back into existence after their demise. We start at the end, by asking just what death is – and it turns out to be perhaps surprisingly complicated, especially if cold...

Earth’s surface may be 70 percent water but many places are struggling to access it. We look at a range of water supply options including delivering it by tanker. In Malta we meet a man trying to solve its water problems, with a clever contraption to recycle sewage. Do you have a question we can turn into a programme? Email us at crowdscience@bbc.co.uk Presenter: Marnie Chesterton Produders: Cathy...

It sounds like a simple question – what is the time? But look closer and you realise time is a slippery concept that scientists still do not fully understand. Even though we now have atomic clocks that can keep time to one second in 15 billion years, this astonishing level of accuracy may not be enough. The complexity of computer-controlled systems, such as high-frequency financial trading or self...

From Chihuahuas to Great Danes, Mexican Hairless to Afghan Hounds, dogs are the most diverse mammal on the planet. There are currently over 500 recognised breeds worldwide with almost every conceivable combination of size, shape, coat, colour and behaviour. But why are there so many different kinds of dog? That's what listener Simon St-Onge in Quebec, Canada wants to know – and CrowdScience has ta...

Modern Martian hunting involves looking for the tiniest evidence of life. But when presenter Marnie Chesterton found out that a scientist she was meant to be chatting to about cleanliness had previously worked for NASA, the topic of space bugs turned out to be too intriguing to ignore, especially when a CrowdScience listener asked us a question on a similar theme. Could Earth's microbes hitch a ri...

To be healthy you need to be clean – or so we’ve thought throughout human history. The dazzling array of antibacterial products that exploded onto the scene in the 20th century took things to the next level, with their promises of eliminating 99.9% of germs. But could an obsession with cleanliness actually be bad for us? There’s a whole world of microbes out there: some make us sick, but others ar...

Is there a killer asteroid with Earth’s name on it? The dinosaurs ruled for many millions of years before coming to their violent end. Will humanity prevail or are we doomed to succumb like the dinosaurs? It’s a question that will keep you up at night. No wonder our listeners Zarin and Pablo wanted to know more. To find out, Anand Jaggtia heads to Denmark to see first-hand the evidence for a giant...

Why can't we use energy from the waves of the sea to create all the electricity that we need? Listener Michael in Kingston, Jamaica wants to know. Living on a Caribbean island means he’s never far from the might of the ocean – so could it power his house? Presenter Greg Foot heads to one of the world’s leading wave energy test locations, the coast of Cornwall in the UK, to find out. There, he witn...

Most of us want to be nice. But is it all it's cracked up to be? It's a question that's been nagging at listener Tony in Illinois, USA, for over 25 years. While studying at university, the lecturer asked him whether competing or co-operating was the best strategy for success – essentially, does it pay to work together or should we sharpen our elbows and look after number one? Nastaran Tavakoli-Far...

How would a fourth dimensional being appear to humans? "It would look just weird" is one way to answer the question 'How would a fourth dimensional being appear to humans?' But it's more complicated than that - theoretical cosmologist Andrew Pontzen describes how objects are viewed from one dimension to another, and how it might affect parking spaces. Also on the programme: our panel of experts di...

What effect does air travel have on the climate? That is the question listener Neil sent CrowdScience from New Zealand. If you have ever looked up at the sky and seen the wispy white streaks that airplanes leave behind, then you are looking at one of the major environmental impacts of air transport – contrails. To find out more, Anand Jagatia goes on a journey through the rugged, lava-ridden Icela...

Where did the first viruses come from? They have the potential to wipe out life on Earth. But could life on Earth itself have evolved from the first viruses? Like the chicken and the egg, there are fierce arguments about which came first and rival scientists get quite cross about it all. We take a dip into the primordial soup of creation and try to answer listener Ian's excellent question. Along t...

How much electric energy storage would it take to run the average home for 24 hours? Also: When will it be economical to locally store several days of electric energy for our home? Listener Gus in Texas, USA, wants to know – especially because he’s one of many people around the world who sometimes face lengthy power cuts. Presenter Marnie Chesterton takes Gus’s question to energy experts. She head...

What do scientists think is outside our universe? Asks Rebecca Standridge from San Francisco in the US. It’s a question which goes right to the limits of human understanding. We look for the answer using balloons, bubbles and the world’s oldest radio telescope. If you have a question about science that you'd like us to investigate email crowdscience@bbc.co.uk . Photo: Lovell telescope Jodrell Bank

Is it possible to get power from lightning? This was the first CrowdScience question posed by listener John Emochu in Kampala, Uganda. Presenter Marnie Chesterton goes hunting for the answer at a lightning lab in Cardiff, Wales. What is a lightning lab? And how was she able to make a tiny – but very loud – lightning bolt? Marnie also discovers humanity's early history with lightning, how aeroplane...