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WHERE DOES YOUR POO GO?

How It Works UK

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Issue 179

Following the flush, your body’s waste undergoes a long journey as it’s prepped to return safely to the environment

- AILSA HARVEY

WHERE DOES YOUR POO GO?

Thanks to an efficient and complex network of underground pipes, tunnels and high-tech wastewater treatment plants, the journey of your poo after you flush is usually out of sight and out of mind. However, with a population of 8 billion people, and with each adult producing an average of 145 kilograms of faeces every year, the safe disposal of masses of human waste is essential. Your faeces are a combination of undigested food – such as insoluble fibre that’s difficult for the body to break down – mucus, bacteria, water and cells from the lining of your intestines. Per gram of faeces, there are 100 billion bacteria. This number changes per person and increases drastically when a person is suffering from an infection. Our bodies often flush out infections through human waste, and so without separating and thoroughly treating sewage, faeces hold great potential to spread disease in communities and the environment.

5 TYPES OF TOILET

1 LONG DROP

PLUS D'HISTOIRES DE How It Works UK

How It Works UK

How It Works UK

UNCANNY'S DANNY ROBINS

The creator and host of the BBC's Uncanny series tells us about his most chilling experiences while researching the show, and writing a ghost book for children

time to read

4 mins

Issue 208

How It Works UK

How It Works UK

HOW FEATHERS GROW

A bird's proteinaceous plumage comes from the same source as our hair

time to read

1 mins

Issue 208

How It Works UK

How It Works UK

New EV battery technology could power 500-mile road trips on a 12-minute charge

Scientists have used a neat chemistry trick to tackle a major challenge facing future batteries.

time to read

2 mins

Issue 208

How It Works UK

How It Works UK

HOW AIR PURIFIERS WORK

These filtration devices clean a room's air of particles that can make a person sick

time to read

1 min

Issue 208

How It Works UK

How It Works UK

Chinese scientists hunt for alien radio signals in a 'potentially habitable' star system

TRAPPIST-1 is a red dwarf star located about 40 light years away that hosts seven Earth-sized rocky planets, with at least three orbiting in the habitable zone where liquid water could exist.

time to read

2 mins

Issue 208

How It Works UK

How It Works UK

WHAT HAPPENS WHEN WE DIE?

Our bodies are vessels for life, but in death they undergo a cascade of chemical and biological changes

time to read

3 mins

Issue 208

How It Works UK

How It Works UK

WHY ARE KEYBOARDS QWERTY?

There's a reason why this seemingly random arrangement of letters is widely used on keyboard layouts

time to read

1 min

Issue 208

How It Works UK

How It Works UK

A 'quasi-moon' discovered in Earth orbit may have been hiding for decades

A new paper describes a possible 'quasi-moon' of Earth, an interloping asteroid that may have been following our planet around for decades, undetected.

time to read

1 mins

Issue 208

How It Works UK

How It Works UK

WHAT'S AN ANTI-DRONE GUN?

How these devices intercept and disable unmanned aerial vehicles

time to read

1 mins

Issue 208

How It Works UK

How It Works UK

Dozens of mysterious blobs discovered inside Mars may be 'failed planets'

Giant impact structures, including the potential remains of ancient ‘protoplanets’, may be lurking deep beneath the surface of Mars.

time to read

2 mins

Issue 208

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