How is it that we know the shapes of the continents from hundreds of millions of years ago? |
- How is it that we know the shapes of the continents from hundreds of millions of years ago?
- Does makeup get absorbed into skin/bloodstream?
- Why/how do fallen leaves stain the sidewalk during autumn?
- What geological event would cause this land formation?
- Why do Diet/Zero drinks always have sodium?
- Can a pathogen be non biological?
- How does breathing work?
- How wide is the "space" that things can orbit earth?
- Where do Astronaut's get their oxygen from in space?
- Why does growing meat add more carbon to the air than plants do?
- How do geese decide where in the v to fly?
- Can inaudible sounds damage our hearing?
- How does Carbamide Peroxide work to whiten teeth?
| How is it that we know the shapes of the continents from hundreds of millions of years ago? Posted: 23 Oct 2019 12:10 PM PDT |
| Does makeup get absorbed into skin/bloodstream? Posted: 23 Oct 2019 12:02 PM PDT Does cosmetics, makeup, anything you put on your skin or hair (including shampoo, condition, lotion, etc) get absorbed into your bloodstream? Is there any concrete proof that it occurs? [link] [comments]  |
| Why/how do fallen leaves stain the sidewalk during autumn? Posted: 23 Oct 2019 04:27 PM PDT |
| What geological event would cause this land formation? Posted: 23 Oct 2019 12:02 PM PDT https://imgur.com/gallery/u2WXcyC To me, it looks like an old volcano blew and spilled magma out, whatever it is, it looks really cool. I'm having trouble googling an answer. [link] [comments]  |
| Why do Diet/Zero drinks always have sodium? Posted: 23 Oct 2019 01:54 PM PDT Everytime I see a drink that is promoted as being diet or zero calorie, it has zero grams of everything except for sodium. Why is sodium the only piece of nutrition in these drinks? [link] [comments]  |
| Can a pathogen be non biological? Posted: 23 Oct 2019 11:56 AM PDT Ok so my immunology professor said "pathogens are only micro organism and hypoxia or any non biological can't be a pathogen" But the other day my pathology prof said "anything that can cause harm to a cell is a pathogen" he also argued that the name itself validate what he said So i went and checked my text book and it didn't really helped cause it kept saying biological pathogens which we can conclude there is a non biological kind aswell If u know the answer pls tell me and mention a reference thank you Also my English is not so good im sorry if i made too many mistakes [link] [comments]  |
| Posted: 23 Oct 2019 11:18 AM PDT Like how does our respiratory system bring the air in? [link] [comments]  |
| How wide is the "space" that things can orbit earth? Posted: 23 Oct 2019 08:21 AM PDT Like for example, a space station. Is there a specific zone a certain distance from Earth it needs to stay to maintain orbit? Or is it a single specific distance? [link] [comments]  |
| Where do Astronaut's get their oxygen from in space? Posted: 23 Oct 2019 07:24 AM PDT |
| Why does growing meat add more carbon to the air than plants do? Posted: 23 Oct 2019 05:37 AM PDT Now I understand that at the surface this seems kind of dumb. Cow has to eat plants and is breathing, which adds carbon it's entire life, then gets given to us, instead of plants that absorb carbon that are fed to us. Simple. But then I was thinking. Wouldn't this process be carbon neutral regardless of whether we eat plants or meat? In the case of plant, it's a shorter path. Plant absorbs carbon and stores it in mostly carbohydrates. So it's basically taken water, sunlight, and carbon dioxide and used that to store energy in the form of some compounds with carbon, hydrogen, and maybe oxygen (not too sure on the chemistry here, but definitely carbon and hydrogen are there.) Gives off some oxygen in the process. Now we eat these molecules, take oxygen, basically combust the molecules and get water, carbon dioxide, and energy as a result. So, carbon from air goes into plant, comes out of our lungs. No carbon was pulled from Earth, no new carbon added to atmosphere. Carbon neutral process. Now with meat, the cow does the same thing we did. Of course it stores some of that carbon in fat and proteins, but again, all of the carbon it is comprised of came from the air. Nobody is digging up oil and feeding it to the cow. Then we eat the cow, releasing some of the carbon it didn't. This process is just less efficient, sure, but in my mind still carbon neutral. Now there is the methane farts of these cows. But methane is again some carbon and hydrogen. So some bacteria are getting fed too. Yet we still hear that meat is much worse for climate change than plants. I don't think this is a false statement yet, but is this simply a logistics issue? As in, the land required to grow the plants came from a forest, the transportation needed, and so on? I want to understand where the new carbon (by this I mean carbon that wasn't in the atmosphere in the last few centuries) is coming into play. Thanks in advance for the answers :) [link] [comments]  |
| How do geese decide where in the v to fly? Posted: 23 Oct 2019 04:19 AM PDT By chance I was under a v of geese long enough on the morning commute (not driving btw) to wach a pair at the back of the v change position with eachother. I was wondering how they choose their position or qhen they know to switch for that matter. [link] [comments]  |
| Can inaudible sounds damage our hearing? Posted: 22 Oct 2019 07:13 PM PDT |
| How does Carbamide Peroxide work to whiten teeth? Posted: 22 Oct 2019 03:38 PM PDT Hi, I understand a few basics but I have further questions I was hoping someone could answer: 1) As I understand, CP breaks down to Hydrogen Peroxide. I read online that CP works for 'longer' and continues to whiten your teeth for many hours after application. How exactly does this work? Is the CP absorbed into your teeth and continue the bleaching process even after you brush your teeth? 2) Why does CP work longer than HP? 3) Can someone provide some solid reasoning to support or deny the claim that LEDs are effective in teeth whitening? Is the LED supposed to activate the CP faster or simply dry out your teeth so that CP can work faster without interference from your saliva? 4) How much CP at 44% needs to be applied, how often, and for how long for beat results? 5) I have read that CP/HP essentially removes a very thin layer of enamel each time you apply it and leave it on. Does this essentially mean that if you continue to apply it, eventually it will remove enough enamel to become harmful/dangerous? Does CP whiten your teeth by actually penetrating your teeth and bleaching the inside, or by removing a thin layer (this essentially only removing surface stains), or both? Thank you! [link] [comments]  |
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