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ALL ABOARD A DOUBLE-DECKER TRAIN

How It Works UK

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Issue 211

Eurostar's new two-tier Celestia trains will take to the tunnels in 2031

- WORDS AILSA HARVEY

ALL ABOARD A DOUBLE-DECKER TRAIN

Since 1994, people have been able to cross the English Channel - the sea that separates the UK from mainland Europe - by journeying underneath it through the Channel Tunnel.

Instead of sailing across the Channel by boat or soaring over the sea by plane, this 31.4-mile rail tunnel enables passengers to zoom along the seabed inside a high-speed train. And from January 2031, Eurostar’s Channel Tunnel-traversing trains will be upgraded to become the first double-decker trains to use the tunnel. These 200-metre-long trains go by the name Celestia, derived from the Latin word caelestis, meaning heavenly. One of the primary goals in creating Celestia carriages is to provide a relaxing and smooth journey between landmasses, with more space and comfort as a priority.

How It Works UK से और कहानियाँ

How It Works UK

How It Works UK

SPACE MINING UNCOVERED

Asteroids rich in rare elements could be harvested for their valuable contents, but the real worth may be in using them as interplanetary fuel stations

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2 mins

Issue 211

How It Works UK

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WHY THINGS ROT

How dead plants and animals decay, and how living organisms rely on this natural process to survive

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Issue 211

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BOOZE, BEANS AND YOUR BODY

Caffeine and alcohol are two of the world's most common drugs. But what effects does drinking them have on our brains and bodies?

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Issue 211

How It Works UK

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HOW TO CLEAN A SKYSCRAPER WINDOW

Discover how skilled window cleaners with nerves of steel tackle these towering glass facades

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Issue 211

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ASTRONAUTS SEE COMET LEMMON 'ABSORBED' BY AURORAE

For skywatchers, scientists and even the astronauts on the International Space Station (ISS), the skies have been active. The Sun has released its largest eruptions of 2025, sparking a series of aurorae that have reached as far south as Mexico. While astronauts on the ISS had to take shelter during the recent solar storms to avoid potentially dangerous radiation, they did manage to capture this image of Comet Lemmon appearing near the aurorae on Earth.

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1 min

Issue 211

How It Works UK

HOW TO MAKE MAPLE SYRUP

Your favourite pancake topping is much more than just a sugary treat made in a factory

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Issue 211

How It Works UK

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A high-fibre diet may ‘rejuvenate' immune cells that fight cancer

Microbes in the gut can help the immune system fight cancer, and a fibre-rich diet may be the key to unlocking those benefits, a study in mice suggests. The immune system is a key player in the body’s battle against cancer. On the front line of this resistance are CD8+ killer T cells, a type of immune cell that marauds around tumours and then exterminates the cancerous cells. But after each successive battle, these cells become worn out and don’t find tumours as effectively. As such, treatments that provide the cells with enough pep to finish their job are in high demand.

time to read

2 mins

Issue 211

How It Works UK

How It Works UK

SEE THE BUTTERFLY NEBULA LIKE NEVER BEFORE

On 26 November 2025, the Gemini South telescope turned 25, and astronomers celebrated its birthday with a dazzling new image of the Butterfly Nebula.

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1 min

Issue 211

How It Works UK

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The Gulf of Suez is pulling apart

The Gulf of Suez, which partially divides Africa and Asia, may still be widening 5 million years after we thought it had stopped.

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2 mins

Issue 211

How It Works UK

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REMOTE ABILITIES

Infrared remotes are cheaper and more power-efficient than Bluetooth alternatives

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Issue 211

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