Where does house dust come from? |
- Where does house dust come from?
- How can Radon be dangerous if it's a noble gas?
- Why is it that when you're in a "dark" room and you focus on a really dark spot, everything, even light, will start to fade away?
- If an object is "blue" because it only reflects blue light, then why isn't it invisible or at least colorless if we shine red light on it?
- Do hyperspheres always have the smallest surface area to volume ratio for any natural number dimension?
- Does Earth's atmosphere reach out equally in all distances?
- Can burning or high temperature decompose any compounds, including radioactive ones?
- Why does the prevalence of clouds increase by seasonal change?
- Do any other particles besides photon have zero mass?
- Why do geosynchronous satellites not fall to earth?
- Why do alpine plant species (particularly Larches) only grow at high elevations?
- Why do certain neutron proton ratios make an atom unstable? How is it unstable and what happens?
- How and why does exercise cause muscles to develop?
- What happens with weak birds on their way to south?
- If a lion or any animal dies in the wild, what conditions must be present, other than time, in order for the same to become fossilized and preserved for millions of years?
- Why isn’t the Milky Way spherical?
- Robitussin is a combination of an anti-tussive and expectorant. Isn't this counter productive? Won't you end up producing lots of mucus and not coughing it out?
- What factors influence the sound of a collision?
- What is the neural mechanism by which we approximate the passage of time?
| Where does house dust come from? Posted: 14 Oct 2018 05:12 PM PDT It seems that countless years of sweeping a house doesn't stop dust from getting all over furniture after a few weeks. Since the ceiling is limited, where does dust come form? [link] [comments]  |
| How can Radon be dangerous if it's a noble gas? Posted: 14 Oct 2018 08:23 AM PDT I understand that it can be broken down from different radioactive elements, but how come it's still radioactive once it's a noble gas? I thought noble gasses didn't react with anything? [link] [comments]  |
| Posted: 14 Oct 2018 10:47 PM PDT I know I probably didn't make any sense since it's hard to explain but imagine being in a dark room with nothing but a little red LED light in the center of the room, if you focus on a dark corner you can see how this light will fade away into darkness. Why is that? [link] [comments]  |
| Posted: 15 Oct 2018 06:27 AM PDT |
| Posted: 14 Oct 2018 08:23 PM PDT |
| Does Earth's atmosphere reach out equally in all distances? Posted: 14 Oct 2018 12:08 PM PDT |
| Can burning or high temperature decompose any compounds, including radioactive ones? Posted: 15 Oct 2018 04:28 AM PDT |
| Why does the prevalence of clouds increase by seasonal change? Posted: 14 Oct 2018 06:46 PM PDT |
| Do any other particles besides photon have zero mass? Posted: 14 Oct 2018 06:52 PM PDT |
| Why do geosynchronous satellites not fall to earth? Posted: 14 Oct 2018 08:23 PM PDT I have never understood why satellites in geosynchronous orbits stay in orbit. If they are over a fixed point on the earth wouldnt they be pulled to down? I understand how orbits work and how objects in orbit have a vertical velocity that puts them into a constant free fall around the earth but I still dont understand how geosynchronous orbits dont just fall down as they are over a fixed point. [link] [comments]  |
| Why do alpine plant species (particularly Larches) only grow at high elevations? Posted: 14 Oct 2018 07:16 AM PDT I live in Washington state and today my friend and I hiked up to Lake Ingalls to see the Larches and the beautiful lake of course. I understand why the Larches are successful at high elevations; they grow slowly, losing their leaves and not having low branches keeps them from relative harm by insects and fires, losing their leaves allows them to require less water in the winter, etc. I also understand that they have really low shade tolerance so being on top of mountain is a great place to be for them. But with that said, what I don't get is why don't they grow at lower elevations? I'm sure they get out competed but you would still expect to see at least a few at lower elevations I would think. A south facing side would have plenty of sunlight as well. [link] [comments]  |
| Why do certain neutron proton ratios make an atom unstable? How is it unstable and what happens? Posted: 14 Oct 2018 05:27 PM PDT why do they look for stability and what is unstable about the whole thing? [link] [comments]  |
| How and why does exercise cause muscles to develop? Posted: 14 Oct 2018 06:12 AM PDT Usually this is explained by the muscles "getting used to" being strained, but what's happening on a physical level? Does the brain detect exercise and decide to build more muscle cells in the exercised area? [link] [comments]  |
| What happens with weak birds on their way to south? Posted: 14 Oct 2018 08:20 AM PDT I was wondering if they have some kind of signal for a break or if the weak ones just fall from the sky and die. [link] [comments]  |
| Posted: 14 Oct 2018 12:46 AM PDT |
| Why isn’t the Milky Way spherical? Posted: 13 Oct 2018 10:29 PM PDT I've been told the bright band of stars you see in the sky on a clear night is the Milky Way, and specifically you're looking across the "galactic plane". I've never heard the Milky Way being described as spherical, and "plane" indicates a flat object, so what gives? Planets and stars are spherical. Why would the Milky Way be flat? I'm aware that not all galaxies are flat. But what makes ours so special? Side question: What makes all the stars circle around the black hole in the same direction? Around 250 billion stars in the galaxy, and every one of them is spinning the same direction? Why? [link] [comments]  |
| Posted: 13 Oct 2018 08:59 PM PDT |
| What factors influence the sound of a collision? Posted: 14 Oct 2018 02:19 AM PDT So density and structure would influence them I guess, but is there a rule? I.e the denser the objects the lower the frequency etc What other factors could change the sound? Would electromagnetism for example affect it? [link] [comments]  |
| What is the neural mechanism by which we approximate the passage of time? Posted: 13 Oct 2018 09:17 PM PDT I'm going to start this by saying please keep answers relatively simple, or if you can't please provide reading material. I have very little medical knowledge and have a high school education tops. How are we able to approximate the passage of time? Is there a "timekeeping" part of the brain that oscillates at a constant rate? Why does time seem to go by faster the older I get (i.e. a five minute time out to a five year old vs a five minute break to an employee)? Why do I go to sleep and dream a long intricate sequence of events over a period of days and then wake up to find only an hour has passed? [link] [comments]  |
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