How come teeth move back to their original positions if you stop wearing braces? |
- How come teeth move back to their original positions if you stop wearing braces?
- Is there any evidence that pricing a product at, say, 9.99, results in a higher volume of sales than pricing the same product at 10.00?
- An FDA panel approved the Pfizer vaccine by a 17-4 vote. Why did the four people who voted no, vote no?
- when talking about climate change, why do we never talk about the heat that everything produces as a byproduct. Burning coal,nuclear power plants even the electrical grid gives off a ton of heat.Is the heat from the sun trapped in our atmosphere so much worse than the heat we create on earth itself?
- how did scientists decide that proton has a "positive" charge while electron has a "negative" charge?
- How does a tunnel boring machine work?
- What's the point in using Klystrons for producing high power microwaves when the Cavity Magnetron is far smaller and can accomplish the same task?
- What are the lengths of the moon's lines of latitudes?
- SARS-CoV-2: What exactly is the big difference between the so-called mRNA vaccínes of Biontech/Pfizer and Moderna versus the so-called vector vaccines like the one from AstraZeneca?
- There are Covid-19 vaccines with 2 rounds of shots. If a person gets the first shot does it provide any protection until they get the second shot?
- How devices decide which output(e.g. 5V-3A OR 9V-2A) from chargers to use?
- How do whales and other cetaceans prevent water from entering their blowholes while they breathe?
- How does a resistor work?
| How come teeth move back to their original positions if you stop wearing braces? Posted: 11 Dec 2020 08:38 PM PST |
| Posted: 12 Dec 2020 05:22 AM PST Other than the obvious, "It's a penny cheaper," I was wondering if the received wisdom regarding this aspect of consumer psychology has ever been tested and vindicated. Or is it simply a truism that has stuck around out of tradition? [link] [comments]  |
| Posted: 11 Dec 2020 11:16 AM PST |
| Posted: 12 Dec 2020 05:36 AM PST |
| Posted: 11 Dec 2020 11:55 PM PST Hello! I am a ninth-grade student. My chemistry teacher was explaining about the balance of positive and negative charge, and I got the question of how did scientists decide that proton has a "positive" charge while electron has a "negative" one. most of the time my teacher does have answers to my questions; this time, however, she did not have an answer. rather I decided to take help from r/askscience. my question is: what are the criteria they used to decide if the sub-atomic particles were "positive" or "negative"? thanking you, [link] [comments]  |
| How does a tunnel boring machine work? Posted: 12 Dec 2020 05:50 AM PST They're huge and flat so I can't imagine them drilling. [link] [comments]  |
| Posted: 12 Dec 2020 05:42 AM PST I know that the Cavity Magnetron uses pulse modulation while the Klystron amplifies a continuous RF signal. but that shouldn't make too much of a difference so why bother? [link] [comments]  |
| What are the lengths of the moon's lines of latitudes? Posted: 12 Dec 2020 05:07 AM PST I've been searching everywhere and can't find out how long the moon's various lines of latitudes are. Specifically, I want to know the approximate distance from the heart of the Sea of Showers (https://en.wikipedia.org/wiki/Mare_Imbrium), all around the moon along a straight line, and back again to the heart of the Sea of Showers. Any help would be appreciated. [link] [comments]  |
| Posted: 11 Dec 2020 01:48 PM PST The more I read, the more confused I get. Maybe someone here could help. All variants of SARS-CoV-2 vaccines use a vehicle to infiltrate cells (a virus shell called vector respective a fat sphere) and in there depose their load (some landmark SARS-CoV-2 proteins respective some SARS-CoV-2 mRNA), thus inducing the body to produce defences against SARS-CoV-2. Apparently there are some differences in detail, but why is there so much fuss about these differences in detail, as if these were entirely different methods? In particular, why is one variant (mRNA) named after the load and one variant (vector) after the vehicle? And does not Moderna use a vector to transport their mRNA load, so both designations should apply to its vaccine? [link] [comments]  |
| Posted: 11 Dec 2020 11:26 AM PST |
| How devices decide which output(e.g. 5V-3A OR 9V-2A) from chargers to use? Posted: 11 Dec 2020 12:53 PM PST I recently bought an android tablet and on the charger output it's written 5V-3A OR 9V-2A. I'm curious which of these two output pairs the tablet's gonna use? Why do devices have various voltage ratings anyway?Why don't they use same voltage rating, so it would be easier to use chargers? [link] [comments]  |
| How do whales and other cetaceans prevent water from entering their blowholes while they breathe? Posted: 11 Dec 2020 10:50 AM PST As the holes seem to be typically situated on a small mound, I'm curious to know if there are some systems to allow them to intake air but keep water out, or do they really just stick their blowhole out and avoid the water? [link] [comments]  |
| Posted: 11 Dec 2020 06:34 AM PST So when you say touch a copper wire to the two terminals on a car battery there will be a really high flow of current and burn the wire in two pretty quickly. How does a resistor restrict the flow electrons without getting hot and burning out? [link] [comments]  |
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