# Is dust really people?

## Метаданные

- **Канал:** Be Smart
- **YouTube:** https://www.youtube.com/watch?v=2KaAHD2TOos

## Содержание

### [0:00](https://www.youtube.com/watch?v=2KaAHD2TOos) Segment 1 (00:00 - 01:00)

(finger squeaking) - Is dust just people? You may have heard, like me, that the dust that collects around your house is mostly made of dead human skin cells. Is that really true? Well, as usual, the answer's more complicated and more interesting, but that's also not totally wrong. Humans shed about a gram of skin every day. We actually replace our entire outer epidermal layer every two to four weeks. That means that your dead body does make up a significant portion of the dust on your windowsill, but dust is also much more than that. Under a microscope, dust contains a whole world of shapes and colors. It's almost beautiful in a really gross way. Now, one famous study of households in the Midwest found that a third of dust comes from stuff inside the home. In addition to skin cells from you and your pets, that includes food debris and fibers from clothing and furniture, plus microscopic dust mites just feeding on all that debris from you and your belongings. But the other two thirds of household dust actually comes from outside the house, including dirt, pollen, feces, eh, environmental pollutants. There's even trace amounts of space minerals from meteorites and distant exploding stars that just shower down to Earth. Dust is basically just a microcosm of your local environment. In fact, it's even used by forensic scientists to help solve crimes. The DNA entombed in dust from a person of interest can help provide valuable information about where they may have traveled. So dust is people. It's just more than that, too. Guess that puts a whole new meaning on cleaning up after yourself. Follow me for more cool science videos.

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*Источник: https://ekstraktznaniy.ru/video/32468*