Where does dust come from? | Questions | Naked Scientists
Mar 9, 2008 · At this time of year the sun starts coming through the window and you can see the surfaces you've dusted carefully are covered with dust . You can actually see dust in the sun beams. I wanted to know where all this dust comes from. My dictionary defines dust as finely powdered earth, dirt etcetera, lying on surfaces and blown about by the wind.
What are the main components and causes of household dust?
Aug 5, 2007 · Answer. Dust is mainly human skin cells. The average person loses between 50-100 thousand skin cells every minute. Those flakes of skin accumulate in carpets and furnishings, dry out and then are lifted into the air by drafts or air currents.Because dust mainly consists of skin cells, it's nutritious and there are some things that will eat it.
Why do magnets affect a tv screen? | Science Questions
Aug 12, 2007 · Lighting these up in different combinations can make all the colours you see on your tv. As electrons fly towards the screen, they can be moved using a magnetic field - this lets you aim the electrons at the right spot of phosphor and get the right colours in the right place. When you put a magnet near the tv, it diverts the electrons away from ...
Why do we see green flashes during sunset? | Science Questions
Jan 8, 2012 · Answer. The last bit of sun you see as it's going under the horizon is actually when the sun is already under the horizon, and what you're seeing is light being bent by the atmosphere, a bit like light is in prism and it's actually bent down towards you. Now, red light is bent less than green light which is bent less than blue light. And so, as ...
How long would it take to wipe all trace of man from Earth?
Nov 9, 2008 · Certainly some of us will be fossilised and we will survive buried in rock strata. To answer the question, when the human race does eventually become extinct, as it certainly will, although evidence of our existence will disappear from the Earth's surface relatively quickly - say within a few millennia - evidence of our existence will survive ...
Why don't our lungs fill up with dust? | Podcasts - The Naked …
Jun 7, 2024 · Why don't our lungs fill up with dust? Also, when did our tail become a coccyx? And what causes the magnetic field? 07 June 2024. Presented by with Krystal Orderson, 567 CapeTalk.
What do you call the coloured light that comes out of stained …
Jul 20, 2016 · The reason the caustic is of interest to physics is because the shape can be described mathematically, like a parabola or catenary. The light from stained glass can be quite saturated and intense, but physically is no different from other filtered light. the feebleminded have inherited the earth.
Are glow-in-the-dark watches a radiation hazard?
Sep 14, 2008 · It depends very much on the type of dial that you're considering. By far the most common watch that you come across that's glow in the dark is called a phosphorescent watch. Essentially the watch is coated in a paint which absorbs light and then re-emits it. These watches are completely harmless. The second type of watch is called a tritium watch.
Why is the moon white? - The Naked Scientists
Nov 11, 2021 · Answer. We asked cosmologist Sarafina Nance to answer this colourful question... Sarafina - That's a good question. There are several different aspects to this answer. One is that the Moon doesn't have life on it. The Earth has oceans and has different landmasses. The other thing is the Moon is composed of various elements, like oxygen and ...
Why is the sky blue in the day and red at sunset?
Oct 10, 2004 · So because it's coming through more atmosphere even more at the blue light is taken away, making the sky look even more red than it was before. So that's why you get the red colouration of the sunset. The other thing that affects this is how many particles there are in the atmosphere, so you tend to see much redder sunsets and yellower moons at ...