Author: BBC World Service

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50 Things That Made the Modern Economy - Barcode

How vast mega-stores emerged with the help of a design originally drawn in the sand in 1948 by Joseph Woodland as he sat on a Florida beach, observing the furrows left behind, an idea came to him which would – eventually – become the barcode. This now ubiquitous stamp, found on virtually every product, was designed to make it easier for retailers to automate the process of recording sales. But, as Tim Harford explains, its impact would prove to be far greater than that. The barcode changed the balance of power between large and small retailers. (Image: Barcode with red laser line, Credit: Jamie Cross/Shutterstock)
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CrowdScience - The Fourth Dimension

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 discuss bubble experiments, a theory that the Black Death was a virus, space elevators, algae as a biomass fuel, what affects the speed of digestion in our gut, a short definition of dark energy and the question is it true our DNA has alien properties?

With Helen Czerski, department of mechanical engineering, University College London; virologist Jonathan Ball, University of Nottingham; and cosmologist Andrew Pontzen, University College London.

Do you have a question we can turn into a programme? Email us at crowdscience@bbc.co.uk.

(Image: Stripes and points of light, one guess what a 4th dimension might look like, Credit: Thinkstock)

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CrowdScience - How Bad is Flying for the Planet?

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 Icelandic landscape with earth scientist Thor and discovers how both natural events like volcanic eruptions as well as man-made acts of terror can shed light on the environmental impact of aircraft. Plus, we meet a man who tailgates 737 airliners to measure their emissions.

Do you have a question we can turn into a programme? Email us at crowdscience@bbc.co.uk.

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50 Things That Made the Modern Economy - iPhone

Surprisingly, Uncle Sam played an essential role in the creation and development of the iPhone - of course, much has been written about the late Steve Jobs and other leading figures at Apple and their role in making the modern icon, and its subsequent impact on our lives. And rightfully so. But who are other key players without whom the iPhone might have been little more than an expensive toy? Tim Harford tells the story of how the iPhone became a truly revolutionary technology. (Photo: Steve Jobs unveils the iPhone, Credit: AFP/Getty Images)
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World Book Club - Margaret Drabble – The Millstone

This month World Book Club is talking to the acclaimed British writer Margaret Drabble about her remarkable novel The Millstone.

At a time when illegitimacy is taboo, Rosamund Stacey is pregnant after a one-night stand. Despite her independence and academic brilliance, she is naïve and unworldly and the choices before her are daunting. She must adapt to life as a single mother, but in the perfection and helplessness of her baby she finds a depth of feeling she has never known before.

The Millstone conjures a London of the sixties that is not quite yet swinging and where sexual liberation has not quite yet arrived.

(Picture: Margaret Drabble. Photo credit: Ruth Corney.)

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CrowdScience - The Origin of Viruses

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 the way, we revisit medieval plagues, travel to Texas to the largest urban bat colony in the world and take a walk through the dense mosquito-infested Ugandan forest that gave its name to the Zika virus.

Plus, we reveal how a virus is responsible for the placenta. No virus, no placenta; no placenta, no humans?

Do you have a question we can turn into a programme? Email us at crowdscience@bbc.co.uk

This programme has been edited since broadcast to remove a brief reference to ‘bubonic plague’ being included in a list of viral diseases.

(Photo: HIV viruses attacking a Cell. Credit: ThinkStock)

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50 Things That Made the Modern Economy - Concrete

It's improved health, school attendance, agricultural productivity and farm worker wages, but concrete has a poor reputation. It takes a lot of energy to produce and releases a great deal of CO2 in the process. However, architects appreciate its versatility and there are few more important inventions. Tim Harford tells the remarkable hidden story of a ubiquitous, unloved material. (Image: Masons hands spread concrete, Credit: APGuide/Shutterstock)
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50 Things That Made the Modern Economy - Shipping Container

The boom in global trade was caused by a simple steel box. Shipping goods around the world was – for many centuries – expensive, risky and time-consuming. But, as Tim Harford explains, 60 years ago the trucking entrepreneur Malcolm McLean changed all that by selling the idea of container shipping to the US military. Against huge odds he managed to turn 'containerisation' from a seemingly impractical idea into a massive industry – one that slashed the cost of transporting goods internationally and provoked a boom in global trade. Producer: Ben Crighton Editors: Richard Knight and Richard Vadon (Photo: Container ship travelling along the Suez Canal, Credit: Science Photo Library)
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CrowdScience - Home Power Storage

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 heads to two national research facilities: The National Grid Scale Energy Storage Lab at University College London, and the Joint Center for Energy Storage Research at Argonne National Laboratory near Chicago – which originated from the early stages of the Manhattan Project. On the way, Marnie finds out where the word ‘battery’ came from, discovers why our mobile phone batteries gradually die with age, and hears how the next generation of power storage could change the world.

Presenter: Marnie Chesterton Producer: Jen Whyntie

(Picture: Isolated cabin at night Credit: Ed Jones/AFP/GettyImages)

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50 Things That Made the Modern Economy - Haber-Bosch Process

Saving lives with thin air - by taking nitrogen from the air to make fertiliser, the Haber-Bosch Process has been called the greatest invention of the 20th Century – and without it almost half the world’s population would not be alive today. Tim Harford tells the story of two German chemists, Fritz Haber and Carl Bosch, figured out a way to use nitrogen from the air to make ammonia, which makes fertiliser. It was like alchemy; 'Brot aus Luft', as Germans put it, 'Bread from air'. Haber and Bosch both received a Nobel prize for their invention. But Haber’s place in history is controversial – he is also considered the 'father of chemical warfare' for his years of work developing and weaponising chlorine and other poisonous gases during World War One. Producer: Ben Crighton Editors: Richard Knight and Richard Vadon (Photo: A farmer sprays fertiliser. Credit: Remy Gabalda/Getty Images)