If grasses evolved relatively recently, what kinds of plants were present in the areas where they are dominant today? |
- If grasses evolved relatively recently, what kinds of plants were present in the areas where they are dominant today?
- If the gravitational pull of a planet is the same in all directions, why does Saturn, for example, have rings in only one plane? Shouldn't it be inside of a "shell" of debris instead of just having rings?
- How did fish get into isolated mountain lakes, without river outlets?
- What is the temperature threshold for the release of hexavalent chromium from stainless alloys?
- When batteries are made are they already charged ?
- [Earth Sci.] [Physics] Carrying metal objects increases one's risk of lightning strike. Does it have to be exposed? Can car keys or other objects in my pocket make me a more likely target?
- In layman terms, what is the significance of transconductance?
- Electrical conduction - How could you determine if there is a lot of free electrons flowing slowly or just a few flowing quickly?
- What exactly is muscle memory and how does it work?
- If the Earth suddenly vanished, how long would it take for the moon to get pulled into the sun?
- Do insects and arachnids heal from sustained injuries?
- Are double and triple bonds more stable or more reactive than single bonds?
- Why is plastic so hard to break down and why is it so hard to reuse?
- If you put a hot object into space does it cool down and if so is it faster or slower than when the same hot object is in an atmosphere (of a lower temperature)?
- If a noise loud enough to travel around the entire world is made, would there be a noticeable increase in the volume at the opposite point on Earth where the sound waves converge?
- Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology
- Why do organisms larger than insects not go through a metamorphosis? What caused certain insect species to evolve to have a metamorphic process in their life cycle?
- Why are there the same fish in different lakes across the world?
- How and why does Deoxy-Hemoglobin polymerize in Sickle Cell Disease?
- What causes bleeding after IUD insertion?
- Does Lac-operon have negative or positive gene regulation?
- Are all lightning bolts that make contact with the ground roughly the same ‘strength’? Does there power differ much from bolt to bolt, storm to storm, location to location?
| Posted: 11 Sep 2018 11:32 AM PDT Also, what was the coverage like in comparison? How did this effect erosion in different areas? For that matter, what about before land plants entirely? Did erosive forces act faster? [link] [comments]  |
| Posted: 12 Sep 2018 05:19 AM PDT |
| How did fish get into isolated mountain lakes, without river outlets? Posted: 12 Sep 2018 01:05 AM PDT |
| What is the temperature threshold for the release of hexavalent chromium from stainless alloys? Posted: 12 Sep 2018 05:21 AM PDT As per the OSHA safety sheet on hexavalent chromium, workers can be exposed to the toxic substance during "Welding and other types of "hot work" on stainless steel and other metals that contain chromium." I'm familiar with the fact that this is a thing, and with the health and safety risks, but I've been unable to dig up any specific tests or hard data as to what exactly the threshold for this is. Neither the materials from OSHA, EPA, and CDC, nor the few other papers I've dug up on google seem to provide an answer here... they all seem to be more oriented toward the various health concerns and the mechanisms behind them. This is applicable to my daily life as a D17.1 aerospace TIG welder (and machinist), however what really sparked the question is that stainless steel wire is commonly used as a heating element in electronic cigarettes and I'm curious to know if there's a concern of hex-chrome exposure from that. [link] [comments]  |
| When batteries are made are they already charged ? Posted: 12 Sep 2018 05:21 AM PDT |
| Posted: 12 Sep 2018 06:22 AM PDT |
| In layman terms, what is the significance of transconductance? Posted: 12 Sep 2018 05:11 AM PDT Most textbooks and Google say that it establishes a relationship between an output and an input quantity (current and voltage) but I want to better understand the significance of this factor. [link] [comments]  |
| Posted: 12 Sep 2018 06:57 AM PDT Consider a straight wire of known length, cross-sectional area and resistivity. Applying a known voltage results in a known current. How could you determine if there is a lot of free electrons flowing slowly or just a few flowing quickly? In particular, how would you do this experimentally? Thanks! [link] [comments]  |
| What exactly is muscle memory and how does it work? Posted: 11 Sep 2018 10:55 AM PDT |
| If the Earth suddenly vanished, how long would it take for the moon to get pulled into the sun? Posted: 11 Sep 2018 11:32 PM PDT |
| Do insects and arachnids heal from sustained injuries? Posted: 12 Sep 2018 05:07 AM PDT |
| Are double and triple bonds more stable or more reactive than single bonds? Posted: 12 Sep 2018 06:21 AM PDT I'm a high school student with some confusion regarding my chemistry classes. I remember my teacher explaining in one course that double and triple bonds are more stable than single bonds, however at the same time I've learned that double and triple bonds are also considered functional groups, which means that these will react with other compounds easier? To me it seems like these two statements kinda contradict each other? I would highly appreciate some form of explanation because I'm really lost right now.. Thanks! [link] [comments]  |
| Why is plastic so hard to break down and why is it so hard to reuse? Posted: 12 Sep 2018 02:21 AM PDT |
| Posted: 12 Sep 2018 02:04 AM PDT Just curious but based upon my limited knowledge of temperature it is the magnitude of movement of atoms in a medium. If you put a hot object into a perfect vacuum there must be no means for the heat energy to transfer to the surrounding environment and therefore the object must remain at the same temperature forever. Is this correct? [link] [comments]  |
| Posted: 12 Sep 2018 03:33 AM PDT |
| Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology Posted: 12 Sep 2018 08:12 AM PDT Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Economics, Political Science, Linguistics, Anthropology 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: 11 Sep 2018 09:35 PM PDT |
| Why are there the same fish in different lakes across the world? Posted: 12 Sep 2018 06:31 AM PDT Did they somehow move from lake to lake? Or did they all evolve separately? How can you have bass in Minnesota and in Florida? [link] [comments]  |
| How and why does Deoxy-Hemoglobin polymerize in Sickle Cell Disease? Posted: 12 Sep 2018 06:31 AM PDT What exactly happens on the chemical level and why? How does a single amino acid mutation in the beta chain of hemoglobin cause it to stick together? [link] [comments]  |
| What causes bleeding after IUD insertion? Posted: 11 Sep 2018 09:06 PM PDT Directly after a copper or hormonal IUD is inserted, it's common to experience some bleeding or spotting that can last from days to weeks. What exactly causes that bleeding? I'm curious about what specifically happens in the body. Everything I can find just says that bleeding usually occurs and is normal, but doesn't explain why. [link] [comments]  |
| Does Lac-operon have negative or positive gene regulation? Posted: 12 Sep 2018 04:49 AM PDT |
| Posted: 11 Sep 2018 07:15 PM PDT |
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