Why does a woman’s risk of having a baby with Down Syndrome increase with her age, when women are born with all the eggs they will ever ovulate? |
- Why does a woman’s risk of having a baby with Down Syndrome increase with her age, when women are born with all the eggs they will ever ovulate?
- What did the mile-high ice sheet covering North America look like?
- 2 years later, do we have any data or suggestion on why people react so wildly differently to COVID?
- Do viruses have any beneficial function at all for the ecosystem?
- The Credibility and Ramifications of Ocean Fertilization Reducing Carbon?
- Do animals have episodic memory?
- Is there a difference between electrical impulses sent to the brain by different sensory organs (say, between an impulse sent by the inner ear and one sent by the optic nerve)?
- Why isn't everyone O blood type by now?
- Is it possible to have solid that absorbs only 1 type of liquid?
- Would childhood obesity make losing weight as an adult more difficult because of higher fat cell count or anything as as a result of it?
- Why are clade diagrams structured the way they are?
- What is the CMB scattering or reflecting off of for us to see it?
- How does DNA control how an embryo grows?
- How do Spacecraft and Satellite Electronics Deal With the Inability to Ground Themselves?
- Why do some birth controls stop your period?
| Posted: 28 Jun 2022 07:54 AM PDT I just don't understand why the risk of "producing" an egg - or ovulating an egg - with an extra copy of chromosome 21 increases with age, when the woman has all her fully formed eggs in her ovaries at birth? Or do the ovaries for some reason start to ovulate more eggs with the extra chromosome 21 as a woman ages? [link] [comments] |
| What did the mile-high ice sheet covering North America look like? Posted: 28 Jun 2022 06:41 AM PDT I've read lots of references to the Laurentide ice sheet being a mile thick layer of ice covering Canada and part of the US but I'm struggling to visualize what this would look like. Did it eventually slope down to ground/sea level at its edges? Or could you walk on dry ground next to it with open air on one side and a mile high wall of ice on the other? What happened when it encountered mountains? Did the ice move like glaciers or did the sheet just add and lose ice at the edges? How did weather work over the ice sheet if for thousands of miles in any direction, the "ground" was a over 5,000 feet higher than the rest of the continent and surrounding oceans? Did clouds run into it and get stuck? Did they exist over it? [link] [comments] |
| 2 years later, do we have any data or suggestion on why people react so wildly differently to COVID? Posted: 27 Jun 2022 03:59 PM PDT How come most people get mild or no symptoms at all, and other people die? That's quite a range of afflictions. Do we know anymore than 2 years ago? [link] [comments] |
| Do viruses have any beneficial function at all for the ecosystem? Posted: 27 Jun 2022 06:58 AM PDT |
| The Credibility and Ramifications of Ocean Fertilization Reducing Carbon? Posted: 28 Jun 2022 06:18 AM PDT The Highly Controversial Plan To Stop Climate Change I am not an environmental scientist, a climate scientist, nor a resource scientist, but I do have a fairly robust understanding of our current predicament in regards to climate change. The video I've linked presents Russ George, who claims that based upon his research, a planet wide bloom of phytoplankton could absorb a significant percentage of the world's carbon. I have several questions about this. Based on what I've seen, his message is backed by research. However, I'm unaware whether or not it is peer reviewed, or even seriously considered by others within his field. If it were to be true, then I would imagine climate scientists would be talking about this nonstop, but I've only just heard about it. I can't tell, and any clarity on whether or not his work and claims are credible would be helpful. If it is credible, then I have several further questions. What would be the ecological ramifications of having a phytoplankton bloom on a global scale? Beyond that, how much time would it buy humanity to switch over to carbon neutral methods of energy production? Thank you in advance for any insight into this issue. [link] [comments] |
| Do animals have episodic memory? Posted: 27 Jun 2022 06:40 AM PDT I was driving past an equestrian place the other day while there was a show happening. I drove past again the next day and all the horses were back in their fields quietly munching grass, and it got me wondering whether they had any memory of the previous day's events. We know that animals are able to remember which plants or other animals are good to eat, and which ones are dangerous, but I wouldn't call this episodic memory. We also know that many animals can be trained to perform a certain action which they associate with a reward, but I doubt a dog is remembering what happened in training when told to sit - it's become an instinct. Conversely we know that abused dogs will exhibit fear of humans, of men, or of particular objects because of negative experiences associated with these things, but are the dogs remembering specific times that they were hurt by these things, or is it again just a learned instinct? When we as humans recall a memory, we are to all intents and purposes experiencing a dulled down abbreviated version of the original sensory inputs that created it (although obviously the sensory neurons from the body aren't involved this time). We know that it's only a memory, but I'm wondering whether an animal would be able to make this distinction. Perhaps the horses in my introduction would become really confused as to why they were eating grass but at the same time being ridden around, hearing a crowd but at the same time not seeing one, then suddenly seeing a crowd but not hearing any noise, then chewing on grass again but at the same time feeling a bit in their mouths. Do animals possess the intelligence to distinguish memories from live experiences, or is this a reason why they can't possess episodic memory, because it would mess with their heads too much? [link] [comments] |
| Posted: 27 Jun 2022 06:14 AM PDT Or are they the same type of electrical signal and the brain somehow differentiates between them to create different representations? [link] [comments] |
| Why isn't everyone O blood type by now? Posted: 27 Jun 2022 09:58 PM PDT "Two O blood type parents can produce a child with only O blood type. Two parents with A blood type can produce a child with either A or O blood types. Two parents with B blood type can produce a child with either B or O blood type. One parent with A and another with B can produce a child with A, B, AB or O blood types. If one parent has A and another has AB, they can either produce a child with A, B or AB blood types. If one parent has A and another has O, they can either produce a child with A or O blood types." If most parental combinations can produce an O baby and two O's can only produce O, why isn't everyone O? [link] [comments] |
| Is it possible to have solid that absorbs only 1 type of liquid? Posted: 27 Jun 2022 03:58 PM PDT My friend asked me a question: I was wondering if we could made a solid that would suck the water but not the other liquids.. Honestly that made me think and I don't have an answer… Is it possible? [link] [comments] |
| Posted: 27 Jun 2022 11:28 AM PDT (I didn't get any answers on r/loseit and a mod on r/nutrition recommended to post this here) I'm not going to quote any sources but correct me if I get anything wrong. I did some googling and reading on Reddit, and heard that when you grow up obese, your body makes more fat cells to store fat and that number gets locked in after adolescence, or they won't be made except under extreme circumstances afterwards. Also that generally childhood obesity makes the body have a tendency / more "biologically wired" to store fat or more fat. Let's say I have person A and person B. A had childhood obesity while B didn't, and both have the same stats that would be put in a TDEE calculator like this one (sex, age, physical activity, etc.) except for weight, but if they enter in the same weight, both would get the same TDEE Result. If they both ate, let's say 2000 calories a day, would person A weight noticeably more, or they weigh about the same (and any difference would just be the result of being 2 different people)? [link] [comments] |
| Why are clade diagrams structured the way they are? Posted: 27 Jun 2022 03:55 PM PDT why is it always two divergences between clades? can a three-way divergence (three clades split from one at the same time) be made and what would that look like? [link] [comments] |
| What is the CMB scattering or reflecting off of for us to see it? Posted: 27 Jun 2022 09:03 AM PDT When we see a distant star or galaxy, we are seeing light that is coming toward us from a luminous source. When we see a planet, we are seeing light reflected back at us after scattering on the planet's surface. But I've never understood how we 'see' the CMB. If it represents the early universe before any luminous structures existed (i.e. "background"), and that early universe is expanding away from us, what surface sent those photons toward us? Are they just flying in every random direction? I suspect I am just thinking about universal expansion incorrectly, but would love some clarification. Thanks! [link] [comments] |
| How does DNA control how an embryo grows? Posted: 27 Jun 2022 01:25 AM PDT I googled it and can't figure it out, when a zygote starts developing into an embryo( I think that's how it works) it's one cell that's starts dividing and dividing until you have a whole baby right, how does DNA show the way for all the cells to know how to divide? Develop? [link] [comments] |
| How do Spacecraft and Satellite Electronics Deal With the Inability to Ground Themselves? Posted: 26 Jun 2022 08:22 PM PDT I know that electronics can function without grounding, but I am curious how high-reliability electronics are made when grounding isn't an option. [link] [comments] |
| Why do some birth controls stop your period? Posted: 26 Jun 2022 09:08 PM PDT I was wondering why some birth controls lessen or completely get rid of your period. From what I understand some do this while others don't. What's the biological reason for this and what in birth controls causes it? Sorry is this is a dumb question, thanks a bunch 💜 [link] [comments] |
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