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05 May 2021

Five things to know about: Mixing and matching coronavirus vaccines

Amid global vaccine rollouts, with nearly 1.2 billion doses currently administered, some countries have recommended a mixed-dose approach where a first prime shot is followed by a booster of a second type. 
03 May 2021

Q&A: Nanobots could explore human cells – but their size is an engineering challenge

Scientists are developing virus-sized robots that could defuse blood clots, explore human cells or even scrub water of impurities.
03 May 2021


How do you design and build a robot that you can’t even see? And what would you use it for? In May, Horizon explores the developing field of nanorobotics and its potential applications. We speak to Prof. Brad Nelson at ETH Zurich in Switzerland whose team found that the nanobots they were working on destroyed the drugs they were meant to be delivering, so are now repurposing them to purify water. We speak to researchers who are using the origami-like properties of DNA to make tools such as nanorobotic boxes with lids that open, and others that have created a molecular robotic arm that can pick up, reposition and release molecules. And because tasks like going into a blood vessel to dissolve a dangerous clot would be ideal for a nanorobot, we find out how scientists are devising ways to enable nanorobots to travel through the bloodstream.
29 April 2021

‘The line is getting fuzzier’: asteroids and comets may be more similar than we think

As anyone who has ever tried to clean a home knows, ridding yourself of dust is a Sisyphean effort. No surface stays free of it for long. It turns out that space is somewhat similar. Space is filled with interplanetary dust, which the Earth constantly collects as it plods around the sun – in orbit, in the atmosphere, and if it’s large enough, on the ground as micrometeorites.
27 April 2021

‘Impossible to adapt’: Surprisingly fast ice-melts in past raise fears about sea level rise

Studies of ancient beaches and fossilised coral reefs suggest sea levels have the potential to rise far more quickly than models currently predict, according to geologists who have been studying past periods of warming.
26 April 2021

What happens below Earth’s surface when the most powerful earthquakes occur

At 03:34 local time on 27 February 2010, Chile was struck by one of the most powerful earthquakes in a century. The shock triggered a tsunami, which devastated coastal communities. The combined events killed more than 500 people. So powerful was the shaking that, by one NASA estimate, it shifted Earth’s axis of spin by a full 8 cm.
22 April 2021

Paris to Berlin in an hour by train? Here’s how it could happen.

The hyperloop is what you get when you take a magnetic levitation train and put it into an airless tube. The lack of resistance allows the train, in theory, to achieve unseen speeds, a concept that is edging closer and closer to reality – and could provide a greener alternative to short-haul air travel.
20 April 2021

Do you trust automated cars? If not, you’re not alone

Picture yourself speeding down the highway with no hands on the wheel, checking your emails while your car takes care of responding to what’s happening on the road. Would you trust your car to make the right decisions? If you have doubts, you’re not alone. 
19 April 2021

How scientists are ‘looking’ inside asteroids

Asteroids can pose a threat to life on Earth but are also a valuable source of resources to make fuel or water to aid deep space exploration. Devoid of geological and atmospheric processes, these space rocks provide a window onto the evolution of the solar system. But to really understand their secrets, scientists must know what’s inside them.
15 April 2021

Sponge parks and vertical gardens – how cities are using nature to overcome extreme weather

In January 2021, Storm Christoph pummelled the United Kingdom with heavy rains and the threat of unmanageable runoff. But in flood-prone Manchester, a newly developed park was proving its worth.