Why was the number 299,792,458 chosen as the definiton of a metre instead of a more rounded off number like 300,000,000? |
- Why was the number 299,792,458 chosen as the definiton of a metre instead of a more rounded off number like 300,000,000?
- How are lab rats given specific diseases?
- Probably a stupid question, but is the sun cooling down?
- Why is electric field at a point discontinuous if there is a charge at that point?
- Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science
- Wikipedia says that if you get liposuction, even with dieting and exercise, the fat cells removed will return to the body within a few months. What causes this?
- Pregnancy 24h (or more) after ovulation?
- How did engineers integrated algorithms on the first electrical components such as boards and other circuitry?
- How do insects breathe if they don't have lungs?
- When it comes to Carbon-14 dating, why do we measure the ratio between Carbon-14 to Carbon-12, but not Carbon-14 to Nitrogen-14?
- What's keeping cordyceps from attacking humans?
- What are animal sleep cycles like? Are they similar to a human's sleep cycles?
- Are some languages easier to lip read than others?
- [Biology] What mechanism controls/produces the colour banding of a snail shell, cycling through the various colours as it grows?
- [Chemistry] Do radioactive atoms constantly emit radiation or is this only when the element decays?
- How do aortic and pulmonic heart valves work? Especially with no chordae tendineae?
- What makes something the source of a river?
- What do astronauts do with their excrement in the International Space Station?
- Where do bugs go when it rains?
- Is there a proven benefit of writing pen to paper versus writing on a tablet?
- How do search engines get results so quickly?
| Posted: 20 Aug 2019 11:17 PM PDT So a metre is defined as the distance light travels in 1/299,792,458 of a second, but is there a reason why this particular number is chosen instead of a more "convenient" number? Edit: Typo [link] [comments]  |
| How are lab rats given specific diseases? Posted: 21 Aug 2019 08:33 AM PDT I remember seeing a post about rats with pancreatic cancer, how are they given this cancer? Are a bunch of rats bread and the "lucky" ones get sorted out? [link] [comments]  |
| Probably a stupid question, but is the sun cooling down? Posted: 21 Aug 2019 06:49 AM PDT Since it's constantly giving off heat, won't it like... run out of heat at some point [link] [comments]  |
| Why is electric field at a point discontinuous if there is a charge at that point? Posted: 21 Aug 2019 03:58 AM PDT |
| Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science Posted: 21 Aug 2019 08:13 AM PDT Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Physics, Astronomy, Earth and Planetary Science Do you have a question within these topics you weren't sure was worth submitting? Is something a bit too speculative for a typical /r/AskScience post? No question is too big or small for AAW. In this thread you can ask any science-related question! Things like: "What would happen if...", "How will the future...", "If all the rules for 'X' were different...", "Why does my...". Asking Questions: Please post your question as a top-level response to this, and our team of panellists will be here to answer and discuss your questions. The other topic areas will appear in future Ask Anything Wednesdays, so if you have other questions not covered by this weeks theme please either hold on to it until those topics come around, or go and post over in our sister subreddit /r/AskScienceDiscussion , where every day is Ask Anything Wednesday! Off-theme questions in this post will be removed to try and keep the thread a manageable size for both our readers and panellists. Answering Questions: Please only answer a posted question if you are an expert in the field. The full guidelines for posting responses in AskScience can be found here. In short, this is a moderated subreddit, and responses which do not meet our quality guidelines will be removed. Remember, peer reviewed sources are always appreciated, and anecdotes are absolutely not appropriate. In general if your answer begins with 'I think', or 'I've heard', then it's not suitable for /r/AskScience. If you would like to become a member of the AskScience panel, please refer to the information provided here. Past AskAnythingWednesday posts can be found here. Ask away! [link] [comments]  |
| Posted: 21 Aug 2019 05:54 AM PDT |
| Pregnancy 24h (or more) after ovulation? Posted: 21 Aug 2019 05:08 AM PDT Hey, I've read some articles about getting pregnant and most of them are saying that getting pregnant 24h or more after ovulation are nil, but why aren't they exactly 0%? If ovulation egg dies my logic suggests me that it's impossible to get pregnant. Apart from shifting ovulation and irregular cycles, why isn't it 0%? [link] [comments]  |
| Posted: 21 Aug 2019 05:07 AM PDT |
| How do insects breathe if they don't have lungs? Posted: 20 Aug 2019 06:49 PM PDT I just learned that many insects don't breathe, but rather oxygen diffuses into their bodies. So is there no conscious control of supplying their body with oxygen? Wouldn't this be incredibly inefficient? [link] [comments]  |
| Posted: 20 Aug 2019 09:04 PM PDT |
| What's keeping cordyceps from attacking humans? Posted: 20 Aug 2019 02:32 PM PDT Ive been playing the last of us and went down the rabbit hole of fungus zombies that infect insects [link] [comments]  |
| What are animal sleep cycles like? Are they similar to a human's sleep cycles? Posted: 21 Aug 2019 02:53 AM PDT I recently purchased two budgies and every source I see says they need 8 - 12 hours of uninterrupted sleep, which had me wondering if their sleep cycle is similar to ours. Do all/most/some animals go through REM cycles? Do they go through deep sleep? Light sleep? Is sleep still a means of processing what they've experienced throughout the day like humans have? I've noticed my dogs can nap just about anywhere for any length of time too, do they require similar uninterrupted sleep? [link] [comments]  |
| Are some languages easier to lip read than others? Posted: 21 Aug 2019 02:21 AM PDT So lip reading, pretty bad in general I think? But compare something guttural like English to something like mandarin - is there any differences in difficulty for native speakers? [link] [comments]  |
| Posted: 20 Aug 2019 04:01 PM PDT |
| [Chemistry] Do radioactive atoms constantly emit radiation or is this only when the element decays? Posted: 20 Aug 2019 10:54 PM PDT And if the latter is true, is that atom technically 'safe' until it decays? [link] [comments]  |
| How do aortic and pulmonic heart valves work? Especially with no chordae tendineae? Posted: 20 Aug 2019 02:46 PM PDT So I'm doing some research about heart valves and how they work because seeing the gross anatomy of a heart and being told papillary muscles contract to keep the heart closed isn't completely straightforward, based on angles and such. Long story short I can't find any great animations about chordea tendineae and how they work but I got some descriptions so that is a little better. But now i realize the aortic and pulmonary DON'T EVEN HAVE THEM WHICH JUST MAKES PAPILLARY MUSCLES AND CHORDAE TENDINEAE EVEN MORE CONFUSING. Tl;dr Basically i need to know how they are withstanding massive pressures (aortic valve) without any of these "support beams" that the AV valves have? [link] [comments]  |
| What makes something the source of a river? Posted: 20 Aug 2019 11:34 AM PDT Like when people say they searched for the source of the Nile, but it turns out to be some tiny puddle stream thing. How come that is the source of all the water in the Nile? [link] [comments]  |
| What do astronauts do with their excrement in the International Space Station? Posted: 20 Aug 2019 02:46 PM PDT |
| Where do bugs go when it rains? Posted: 20 Aug 2019 08:17 AM PDT |
| Is there a proven benefit of writing pen to paper versus writing on a tablet? Posted: 20 Aug 2019 09:43 AM PDT I recently started journaling and am hearing that you don't get the "benefit" of writing if on a tablet. edit: when I say writing on a tablet, I mean actually writing with a tablet paired pen on the tablet. Not typing on keys or touching keys on the screen. [link] [comments]  |
| How do search engines get results so quickly? Posted: 20 Aug 2019 02:12 PM PDT When I look something up on google or look up a name on Instagram I get results nearly immediately despite there being like billions of results for the search to look through. Even just making a search for a specific file on my laptop takes a while, so how do companies like these do it so fast? [link] [comments]  |
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