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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

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HOW TO CLEAN A SKYSCRAPER WINDOW

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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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HOW TO MAKE MAPLE SYRUP

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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.

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SEE THE BUTTERFLY NEBULA LIKE NEVER BEFORE

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