Is there a reason that the majority of Earth's landmass is in the northern hemisphere? |
- Is there a reason that the majority of Earth's landmass is in the northern hemisphere?
- What activates seeds to grow? Like, why can I leave a seed sitting on a table for years and it won't do anything but when I put it in dirt and water it, it starts to grow. How does it know, and was it doing?
- Is there are maximum of brightness that light can reach?
- If darker skin colors absorb more heat energy and have a higher resistance to cancer then why did humans who live in snowy/colder climates develop fare skin?
- Does a brain physically change when it gets memories? Does a dead brain still possess the memories it had when it was alive?
- How does mold on a bathroom counter get its food source?
- In xray diffraction, why is it possible to use a fourier transform on a 2D image to get the 3D lattice information?
- Why do people's faces turn red when they're embarrassed?
- Korea has been divided for almost 75 years, how much have the people and language diverged and is this divergence the direct result of isolationism or natural drifting of two countries cultures?
- How do high rise buildings filter outdoor air for circulation?
- How does the length of the primary solenoid inside the secondary solenoid affect the induced current?
- Why is that the English question words “who,” “what,” “where,” “when,” and “why,” all begin with the letters “wh”? Is this a coincidence? Does it have anything to do with the questionesque nature of the word?
- How does a virus, such as chickenpox or HSV, physically damage the skin to cause blisters?
- I saw a double rainbow this afternoon next to each other one being more vibrant having red on its outer arch and violet as the inner. The other rainbow that was less distinct had the the colors in opposite order having violet on the outer circle. How did this happen?
- How is it possible to measure the diameter of distant stars?
- How do clinical risk estimators mathematically calculate the likelihood of an event?
- Frequency dependent gain of a parabolic antenna/reflector, why?
- Why is earth warming faster at the poles compared to other latitudes from climate change?
- Over the course of a year, how many calories have I used just growing hair?
- Why have no giant asteroids hit the earth in recent history?
- What is the relationship between Quantum Field Theory and The Standard Model, are the two compatible?
- If we can see cells with a microscope, why can't we just keep adding lenses/magnification to see atoms fairly clear (with electrons etc.) ?
- If there is no oxygen in space, how do stars continue to burn without the basics for fire? Fuel, Oxygen, and Heat.
- Where does vaginal flora in female come from?
| Is there a reason that the majority of Earth's landmass is in the northern hemisphere? Posted: 20 Mar 2019 03:44 PM PDT |
| Posted: 20 Mar 2019 04:45 PM PDT |
| Is there are maximum of brightness that light can reach? Posted: 21 Mar 2019 05:59 AM PDT I just read that brightness is defined by the amplitude of a lightwave and I just wondered if there is a maximum to that or what the highest brightness is humans achieved to create. [link] [comments]  |
| Posted: 21 Mar 2019 06:30 AM PDT |
| Posted: 20 Mar 2019 07:32 PM PDT |
| How does mold on a bathroom counter get its food source? Posted: 20 Mar 2019 08:53 PM PDT One time I was at a public bathroom and noticed some mold growing under neath the tub that made up the sink, and it got me thinking. The mold probably isn't using the porcelain counter top as a source of food, but there's no obvious sign of organic material or glucose anywhere. And it is growing from a place where sunlight could not reach it. How does it grow and sustain itself? [link] [comments]  |
| Posted: 21 Mar 2019 05:02 AM PDT The key (and annoying) word here is "why". I have an idea, but I would like to hear your thoughts. Taken from a recent exam. [link] [comments]  |
| Why do people's faces turn red when they're embarrassed? Posted: 21 Mar 2019 06:32 AM PDT Exactly as the title says. The body's natural reaction to embarrassment is to flush with blood and turn red. What mechanism or survival instinct causes this and why? [link] [comments]  |
| Posted: 20 Mar 2019 12:08 PM PDT |
| How do high rise buildings filter outdoor air for circulation? Posted: 21 Mar 2019 06:19 AM PDT Not sure if this is the right sub for this question so feel free to delete. I know for houses and apartments we use a small air filter, but how do large high rise buildings do it? Do they have large air filters that are the size of cars? [link] [comments]  |
| Posted: 21 Mar 2019 07:17 AM PDT We were doing some experiments with electromagnetic induction as we stumble upon this experiment, The experiment went like this; each trial we take, we offset the primary solenoid by 10 mm, then we turned the power supply on and off for every trial, and measured the maximum current. The data we gathered was quite inconsistent and we can't really determine a general behavior of the current from it. It would be a huge help to understand how it really the length of the primary coil inside would affect the current. Thanks! [link] [comments]  |
| Posted: 20 Mar 2019 08:53 PM PDT |
| How does a virus, such as chickenpox or HSV, physically damage the skin to cause blisters? Posted: 20 Mar 2019 04:27 PM PDT What process occurs for a virus to cause wounds similar to small burns? [link] [comments]  |
| Posted: 20 Mar 2019 08:41 PM PDT |
| How is it possible to measure the diameter of distant stars? Posted: 20 Mar 2019 05:08 PM PDT |
| How do clinical risk estimators mathematically calculate the likelihood of an event? Posted: 20 Mar 2019 10:59 PM PDT There are a few tools that can be used in a clinical setting to asses if patients are at risk for certain events. One example of this is the ASCVD risk estimator, which will spit out an percentage prediction for how likely you will experience an adverse cardiac event. I understand super basic epidemiology concepts that assess relative risk (x times more likely in this group), but this calculator seems to take in a lot of variables and spit out an exact percentage estimate rather than a relative one. I've read through the resources this tool provides , from which I garnered which databases and studies the tool was derived from, but my question still remains, statistically, how do we create algorithms that can output risk estimation? edit hyperlinks [link] [comments]  |
| Frequency dependent gain of a parabolic antenna/reflector, why? Posted: 21 Mar 2019 05:41 AM PDT I looked into parabolic reflectors and i am confused on why the gain changes with the wavelength. I checked "normal" antennas and apparently near field effects cause the effective arparture of an antenna to change with frequency. Which seems plausible. But as far as i understand it a reflector should just reflect the waves that hit it (it's area) onto a feed antenna in the focus point of the reflector. Doesn't that mean the gain should only depend on the area of the reflector and not change with the wavelength? My thinking is that the effective arparture of the feed antenna shouldn't matter if i focus the incoming wave directly onto the antenna using a reflector. Usually reflectors are explained using rays, my first guess is that that's the oversimplification that loses the frequency dependence? Or is the frequency dependence cause by the feed antenna? [link] [comments]  |
| Why is earth warming faster at the poles compared to other latitudes from climate change? Posted: 20 Mar 2019 07:34 PM PDT |
| Over the course of a year, how many calories have I used just growing hair? Posted: 20 Mar 2019 07:26 PM PDT That's just the calories my body used growing it, not the ones I used making all that hair presentable. [link] [comments]  |
| Why have no giant asteroids hit the earth in recent history? Posted: 20 Mar 2019 07:15 PM PDT |
| Posted: 20 Mar 2019 04:14 PM PDT |
| Posted: 20 Mar 2019 09:36 PM PDT |
| Posted: 20 Mar 2019 06:35 PM PDT |
| Where does vaginal flora in female come from? Posted: 20 Mar 2019 03:23 PM PDT I understand that our gut flora comes from what we ate and skin flora comes from the environment and all that. But where does the vaginal flora come from? If the lactobacillus need an acidic environment to live in, how do people 'caught' it? Why do most female have mainly lactobacillus in the vaginal while the other parts of our body is so diverse in regards with microbiota? And will anyone not have 'caught' lactobacillus but have other healthy bacteria residing in their vagina? [link] [comments]  |
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