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Studies in children who have been severely affected by Covid-19 in Italy, Britain and the US are showing the same thing – a range of symptoms linked to an overactive immune system. Elizabeth Whittaker from London’s Imperial College discusses the similarities in these cases and possible reasons for this syndrome with Shanna Kowalsky from Mount Sinai hospital in New York.

How much should drugs for Covid-19 cost? Remdesivir, which has shown promise against the virus, has been priced at over $2000 for a course of treatment, but drug price analyst Andrew Hill says the cost of production is actually below $10.

And how about some really alternative energy? Marion Cromb at Glasgow University has run an experiment to simulate a spinning black hole. In theory, a rocket sent to an equivalent real black hole could use its rotation as a power source.

Shoes are a surprisingly recent human invention. But running isn’t. That means for most of our time on the planet, we’ve run barefoot. Today, in most countries, it’s rare to see people out in public without shoes, let alone running. But might our aversion to the free foot be causing us pain?

CrowdScience mega-fan Hnin is an experienced runner - she enjoys ultra-marathons back home in Australia. But about six months ago she developed extreme foot pain, the condition Plantar Fasciitis, and this meant she had to stop doing what she loves. She reached out to CrowdScience presenter Chhavi Sachdev, to find out if barefoot running could reduce her pain and improve her performance. Simply put, is barefoot running better?

In an attempt to find Hnin some answers, Chhavi hits the ground… running. Literally throwing off her own shoes on the streets of her home city of Mumbai, India, to see how feeling the ground can change her whole gait. And with Prof. Dan Lieberman, Chhavi learns what sets the human runner apart from other species, while uncovering the strange form our feet have. She speaks with Dr Peter Francis, a researcher whose life’s work has focused on curing the pain in his own feet and learning how to help others.

But performance is also important for runners. Biomechanics and shoe expert Dr Sharon Dixon explains how modifications to the sports-shoe are helping marathon runners set records, and blade-running athlete Kiran Kanojia shows Chhavi how the technology behind her two prosthetic legs let her emulate either natural walking or natural running.

(Image: Getty Images)