Is it possible to contract COVID 19 a second time? |
- Is it possible to contract COVID 19 a second time?
- How come multiple viruses/pathogens don’t interfere with one another when in the human body?
- How certain is the scientific community actually about the big bang theory?
- With planets similar to earth, would an older planet have more islands and more continents compared to a newer one?
- If elettromagnetic radiation can push a body through radiation pressure, the body emitting the radiation is pushed in the opposite direction?
- How do charging pads for your phone work?
- Does the flu vaccine strengthen the body's immune system in general and does the flu vaccine continue working if in the next few years the same strain of flu reappears?
- Why is it that roughly 25% of the numbers less than 100 are prime and as you go past 100 the percentage of prime numbers steadily drops?
- Have we ever killed a virus?
- Are all spider webs the same? Could one spider use another's web, or would it get stuck?
- [Physics] How is reflection of a photon different from absorption/ re-emission? What happens to a molecule when light is reflected?
| Is it possible to contract COVID 19 a second time? Posted: 06 Oct 2020 04:27 AM PDT |
| How come multiple viruses/pathogens don’t interfere with one another when in the human body? Posted: 05 Oct 2020 09:12 AM PDT I know that having multiple diseases can never be good for us, but is there precedent for multiple pathogens "fighting" each other inside our body? [link] [comments]  |
| How certain is the scientific community actually about the big bang theory? Posted: 06 Oct 2020 02:04 AM PDT We have been observing the expansion of the universe for only a very limited duration, given the assumed age of the universe and we are extrapolating this behavior until the start of time. I mean anything could happen during the time we are not observing. The function we are measuring could be as well a wave, but the time frame of our existence wouldn't be long enough to ever measure a compression of the universe. My point is, are there any factors, that makes it certain that the universe is ever expanding and how certain are scientists about the big bang theory. [link] [comments]  |
| Posted: 06 Oct 2020 02:08 AM PDT I watched a video of Pangea forming into the current layout of the world. Islands began to pop up more and more and as Pangea broke the separate continents appeared. Would the same thing happen to a planet similar to earth? Also, as earth ages, will/is it likely the continents and current land masses will continue to separate into smaller parts? [link] [comments]  |
| Posted: 05 Oct 2020 12:30 PM PDT If yes, a laser emitting spacecraft is pushed in the opposite direction? If no, if I attach a laser emitting tool to a solar sail, can I generate a net push of the two body system? Both answers seem to violate some physics law. So I'm probably missing some important point. [link] [comments]  |
| How do charging pads for your phone work? Posted: 06 Oct 2020 05:10 AM PDT |
| Posted: 05 Oct 2020 12:17 PM PDT |
| Posted: 05 Oct 2020 10:51 AM PDT Just like the title says. There are 25 numbers between 1 and 99 that are prime (25%) There are 168 primes between 1 and 1,000. (17%) There are 1,229 primes between 1 and 10,000 (12%) Why are primes more common in smaller numbers than in bigger numbers? [link] [comments]  |
| Posted: 05 Oct 2020 09:21 PM PDT I know viruses aren't alive but are there any examples of a virus we have basically made extinct? [link] [comments]  |
| Are all spider webs the same? Could one spider use another's web, or would it get stuck? Posted: 04 Oct 2020 07:17 PM PDT |
| Posted: 04 Oct 2020 10:45 PM PDT I understand the basic idea of an emission spectrum. But what about an object that doesn't radiate photons? Like when light hits a red apple, the skin of the apple is made of molecules that happen to absorb everything except red wavelengths. The red is reflected into our eyes so we see red. (I know the color vision part isn't that simple, but I'm talking about the basic idea that we see the wavelengths that were not absorbed). What makes a molecule unable to absorb specific wavelengths? And what exactly is happening when a photon is reflected? If it is being absorbed and re-emitted, why doesn't the object glow? (I know the object will eventually glow red if we heat it up enough. But I'm just trying to understand why ordinary non-heated objects appear different colors.) [link] [comments]  |
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