- If 2 objects are traveling at 0.5 the speed of light relative to some 3rd object but in opposite directions, would each perceive the other as going the speed of light? What about 0.6 times to speed of light?
- Why do some vaccines leave scars?
- Why does an absorption spectrum of light exists? Meaning: Why do excited electrons do not re-emit photons of the same energy and as such re-fill the absorption lines?
- Is it possible for me to spread a disease even when I've had it and should be immune?
- Can quantum entanglement be used for sub-FTL communication?
- I have COVID antibodies and have been donating plasma, will my body replace the antibodies that I donated (is there a finite amount)?
- How do erasable pens work?
- Induced magnetic fields in cords?
- Just how many fossils are there?
- Can birds "converse" with other types of birds?
- Why did the earth form with a large mass of land on one side (Pangea)? Were there lesser continents sunken and lost to time?
- Why does snow only happen during the late fall, winter months, and early spring? However, when it hails, it can happen literally any time in the year even though it’s ice precipitation just like snow. Why does this happen?
- what does space smell like?
- How does a modern computer use Boolean logic to compute?
- Do people in a blind vaccine trial get told what group they were in after the trial is over?
- Where does the explosive energy of an airbust meteor come from?
- What determines a volcano's shape?
- Can we lose our sense of touch with age the same way we lose our hearing and vision?
- What is the opposite of clinical depression?
| Posted: 02 Sep 2020 11:45 PM PDT |
| Why do some vaccines leave scars? Posted: 03 Sep 2020 05:36 AM PDT I recently got my BCG vaccine as I work in a lab but when they informed me of the blistering and scaring phase I was a little perplexed. What makes the site blister and scar only after several weeks/months? I know it's to do with your immune system reacting but what is specifically involved / what's the processes involved and why does sometimes it cause such a prolonged severe reaction at the site of injection? ( How come its only with live vaccines too?) [link] [comments]  |
| Posted: 03 Sep 2020 02:01 AM PDT Here's a question that has bugged me for quite a while: In an absorption spectrum of electromagnetic radiation there are absorption lines to be observed, where the electrons have the fitting energy states to absorb a photon of that energy. As such photons of that energy then are missing, causing the gap. What remains is the full spectrum of the radiation, minus those lines that correspond to the elements in the sample between the light source and the observer. Why don't the atoms/electrons re-emit a photon of that energy when they drop back to the ground state, as such re-filling those missing energies again? This applies to stars as well a cloud of gas of some element between an observer and (white) light source. --- A followup to that is: Why do stars even have absorption spectra, aren't most atoms in and near it ionized anyway? And without electrons there'd just be the nuclei, and as such no spectrum of any kind as we know it. So in what area of a star does the absorption actually happen? I assume it must happen in a cloud around the star, that is far enough away to have atoms including the electrons, but still close enough to be so dense that we get proper absorption of all the elements in the star. And this begs another followup: Is there a significant time difference between the star fusing elements inside it (above Helium) and the time we do start to observe the absorption lines showing up in the spectrum? [link] [comments]  |
| Is it possible for me to spread a disease even when I've had it and should be immune? Posted: 03 Sep 2020 03:50 AM PDT If I have had covid 19 or another infectious disease and have built up immunity, is it possible for me to spread it in the amount of time it takes for me to fight it off a second time? [link] [comments]  |
| Can quantum entanglement be used for sub-FTL communication? Posted: 03 Sep 2020 07:23 AM PDT I know that at a base level, quantum entanglement cannot be used for FTL communication, no matter how many layers of math you throw at it (at least that we know of). However, does this same limitation apply at sub-FTL speeds? Or does the speed ultimately not matter? [link] [comments]  |
| Posted: 02 Sep 2020 08:19 PM PDT I've gone 3 times, and curious if my body is replacing the antibodies I donate or not. [link] [comments]  |
| Posted: 03 Sep 2020 02:26 AM PDT How does the ink and eraser of an erasable pen work? I've been curious for a while. [link] [comments]  |
| Induced magnetic fields in cords? Posted: 02 Sep 2020 07:49 PM PDT I always wondered why magnetic fields are not present in cords and cables. For example: if you plug in a lamp and turn it on, the wire has an electrical current running through it. Magnetic fields are supposed to accompany electrical currents. So why, when I hold a piece of iron to a cord that has an active current is there no perceptible magnetic attraction? [link] [comments]  |
| Just how many fossils are there? Posted: 02 Sep 2020 07:23 PM PDT For my son's birthday, I got him a rock and mineral collection for $25. When he opened, it I was surprised that it had several fossils, including an Ammonite and a Mosasaurus tooth (among others), both millions of years old. This has made me very intrigued. The fact that these are included in a $25 set means they are either fake, or these types of fossils are way more plentiful than I previously thought. Obviously there are some fossils that are exceedingly rare. But in general, how many fossils are there in the world? Where do they find such an abundance of certain types that they can be sold so cheaply? [link] [comments]  |
| Can birds "converse" with other types of birds? Posted: 02 Sep 2020 06:23 AM PDT I was just watching a crow and a broad-winged hawk perched together on the top of a tree, a few feet apart. They were facing each other, with what really seemed like a clear back-and-forth type dialogue. They honestly reminded me of two strangers sitting at a bus stop having a friendly conversation. Am I anthropomorphizing a coincidence or could they actually have been having a conversation/dialogue? [link] [comments]  |
| Posted: 03 Sep 2020 04:25 AM PDT |
| Posted: 02 Sep 2020 11:02 AM PDT |
| Posted: 02 Sep 2020 05:21 PM PDT |
| How does a modern computer use Boolean logic to compute? Posted: 02 Sep 2020 11:20 AM PDT Whatever I try and google an answer to this question all I find is page after page of introductory Boolean logic about AND gates, which I very much understand, then at the end of the lesson they just go something along the lines of: "And then the computer makes takes that logic and makes computations." But how? Like, physically how does having a long list of gates sorted into a specific order translate into a computation? [link] [comments]  |
| Do people in a blind vaccine trial get told what group they were in after the trial is over? Posted: 02 Sep 2020 06:35 AM PDT That way someone who didn't receive the vaccine but wants it, can get it. And also someone that did receive it doesn't get it again. [link] [comments]  |
| Where does the explosive energy of an airbust meteor come from? Posted: 02 Sep 2020 01:37 PM PDT So I've been reading a little bit about the Tunguska event and the Chelyabinsk meteor, both of which have been attributed to a meteoroid exploding in "airburst" event, with the object blowing up in midair after entering the atmosphere. I am wondering where the explosive energy (enough to generate a powerful shockwave) comes from in this sort of phenomenon. Intuitively, it's easy to understand the massive explosive energy release when a meteor strikes the ground. But when it's burning up in the air, there is no obvious point at which I'd intuitively expect an explosion-- no moment of impact where the entire system must release its energy violently. In fact, I'd expect the meteor to more "dissolve" under the stress, vs. cause a massive explosion. So my question is, where does the explosive energy in an airbust meteor come from? Why does it blow up instead of fall apart? (edited for spelling/grammar) [link] [comments]  |
| What determines a volcano's shape? Posted: 02 Sep 2020 10:56 AM PDT |
| Can we lose our sense of touch with age the same way we lose our hearing and vision? Posted: 02 Sep 2020 06:18 AM PDT |
| What is the opposite of clinical depression? Posted: 02 Sep 2020 08:50 AM PDT What would it be called if someone was always happy all the time, had high motivation even for the most mundane tasks, and was never sad even when faced with bad news? [link] [comments]  |
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