Could the speed of light have been different in the past? |
- Could the speed of light have been different in the past?
- When I look into the sky. What % of my sight line is neverending nothingness, there is nothing in that line of sight throughout the entire universe? What % of my sight is looking at something, whether the moon or something billions of light years away?
- What makes teeth come up through the gums?
- If decomposers are supposed to decompose, then how do we find such large reserves of oil, gas and coal?
- Does a reverse volcanic eruption exist?
- Is there a theoretical way to determine whether someone had Covid after they are vaccinated?
- How is it possible to survive rabies and why will it almost always kill you?
- If light from the stars takes years to reach earth, and we use a telescope to see that star closer, does that mean we’re technically seeing through time?
- How is it that CTE can only be diagnosed posthumously? Looking at pictures showing the difference between a brain with and without CTE, it seems like it would be very noticeable with an MRI or C/T?
- What is the Lyapunov exponents of a dynamical system and how is it calculated?
- How does a bomb’s fuse know when the bomb has hit the ground?
- Vaccines typically take 10-14 days for immunity to ramp up. How is the body able to fight off infections in less time than this?
- What prevents animals such as deer and rams who fight by bashing their heads together from getting concussions?
- Why is H1N1 not a zoonotic disease?
- Is it actually possible to reconstruct what a person sees by reading their brain waves?
- Are Wikipedia articles a connected graph? For every pair of articles, is there a path from a to b? Or are there islands? How could one prove it?
- If people catch cold and flu viruses from other people (not cold weather or viruses in the air), then how does the very first person (or persons) catch it?
| Could the speed of light have been different in the past? Posted: 27 Mar 2021 05:19 AM PDT So the speed of light in a vacuum is a constant (299,792,458 m/s). Do we know if this constant could have ever been a different value in the past? [link] [comments]  |
| Posted: 27 Mar 2021 03:02 AM PDT |
| What makes teeth come up through the gums? Posted: 27 Mar 2021 02:27 AM PDT I've got a little baby who is teething, and I'm just wondering why teeth are there dormant but come up at such a range of times. Anywhere from 3 months to a year old for the first ones, and then on from there. What biological nudge is the body getting for these teeth to erupt? And again for adult teeth? [link] [comments]  |
| Posted: 27 Mar 2021 04:11 AM PDT Shouldn't they have simply been decomposed by decomposers before they could turn into fossil fuel? One theory that I have heard was that the reason why we have so much fossil fuel reserve is because of the evolutionary arms race between plants and fungus, namely that plants build and fungus breaks. Until plants developed lignin that stopped fungi from breaking them down for the relatively brief Carboniferous period. This caused a lot of dead stuff to be lying around eventually forming fossil fuel. Unfortunately I can't find any source/evidence for this theory so I don't even know if it is correct, but I'd love to know how we ended up having such large reserves of fossil fuel, and if the theory has any merit. [link] [comments]  |
| Does a reverse volcanic eruption exist? Posted: 27 Mar 2021 02:18 AM PDT Hey I was thinking of about the displacement mechanics of volcanic eruptions. In order for an volcanic eruption to occur. Does a reverse volcanic eruption happen when somewhere deep in the ocean whereby the earths core consumes a the crust to fulfill the conservation of mass? [link] [comments]  |
| Is there a theoretical way to determine whether someone had Covid after they are vaccinated? Posted: 27 Mar 2021 01:27 AM PDT I don't believe this is possible now. But is this theoretically possible, or would the "fingerprints" of an active infection left behind always be identical to those of the vaccine? [link] [comments]  |
| How is it possible to survive rabies and why will it almost always kill you? Posted: 26 Mar 2021 08:59 PM PDT |
| Posted: 27 Mar 2021 12:19 AM PDT If it takes 300 light years for the light of a star to reach us, it would mean we see the light it emitted 300 years ago. If we use a telescope to zoom in, does the light still take 300 years to reach us or is it closer? Say we were able to zoom in a get to see the star perfectly, is that still 300 years ago? [link] [comments]  |
| Posted: 26 Mar 2021 02:54 PM PDT |
| What is the Lyapunov exponents of a dynamical system and how is it calculated? Posted: 26 Mar 2021 05:37 PM PDT |
| How does a bomb’s fuse know when the bomb has hit the ground? Posted: 26 Mar 2021 11:34 AM PDT I googled "why does a bomb explode when it hits the ground" and the short answer was that it explodes because of the fuse. But how does the fuse know the bomb has hit the ground, as opposed to just being rattled while in transport or while falling through the air? Is it just set to react to a certain amount of force? Also, what safety measures (if any) are in place so that a bomb doesn't prematurely explode, say, if it bumps into another as they are being dropped together? I'm thinking mostly of the big B-17s that drop a whole payload of bombs. [link] [comments]  |
| Posted: 26 Mar 2021 08:50 AM PDT Take the flu for example. According to Google, flu symptoms typically begin 1-4 days after initial exposure and end 5-7 days after that. So, a whole flu infection typically lasts 6-11 days. However, it usually takes a whole 10-14 days for the body to mount a significant antibody response from a vaccine. How can this be? Is the flu typically fought off with innate immunity only, with antibodies only beginning to show up after the infection is already over? Or is an actual infection able to produce a more prompt antibody response than vaccines can? [link] [comments]  |
| Posted: 26 Mar 2021 10:30 AM PDT |
| Why is H1N1 not a zoonotic disease? Posted: 26 Mar 2021 07:59 PM PDT I am reading some stuff online which says the H1N1 is not a zoonotic disease, but I don't understand why this is. I thought that zoonotic disease simply means a virus that came from a non-human that now infects humans. Doesn't the H1N1 fit this description at is a mixture of bird, pig, and human? [link] [comments]  |
| Is it actually possible to reconstruct what a person sees by reading their brain waves? Posted: 26 Mar 2021 02:00 AM PDT This sounds really cool, but I am somewhat skeptical. How do brain waves carry enough information as to allow reconstruction of entire images? Do these scientists work in ultra controlled environments where they basically already know certain wave patterns correspond to certain images? Or do they actually manage to extract this calibre of information from brain waves? I thought a big problem with interfacing our biological brains with digital technology was the fact that information is not necessarily stored in each person's brain in an objective manner, i.e. there is no universal brain pattern for "cat" or "dog". I'm a little confused, anyone care to shed some light on this awesome but skeptical technology? Thanks! [link] [comments]  |
| Posted: 26 Mar 2021 02:29 AM PDT Has someone tried to do a graph traversal thru the entirety of Wikipedia to check if all nodes can be visited? [link] [comments]  |
| Posted: 26 Mar 2021 03:12 PM PDT |
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