Are human the only animals that can use ketone bodies to fuel the brain? |
- Are human the only animals that can use ketone bodies to fuel the brain?
- Is there a maximum length that a human hair can grow to?
- A recent Imperial College London study predicts that on average, by 2030, South Korean women will live up to 90.82y; Swiss men will live up to 83.95y, these being longest living countries for each gender. Why do women outlive men even in rich, developed, non-warring counties?
- Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology
- Can you generate electricity from the earths magnetic field?
- Would earthquakes still be deadly without buildings and other man-made structures?
- Is there a such thing as recurrent storms or blizzards that roughly occur every XX years?
- Is it theoretically possible to create a laser that emits radio waves?
- In an inelastic collision between 2 objects, how is it possible for momentum, but not kinetic energy, to be conserved?
- Why is the following wrong? (TL;DR I get i(pi)=0)
- (Astronomy) If space is a vacuum, why is it so cold? Where does the temperature "come from?"
- Is there a limit to the number of active Bluetooth connections in a confined space?
- Why does an impedance mismatch cause reflected waves in transmission lines?
- How are molecules filtered by chirality?
| Are human the only animals that can use ketone bodies to fuel the brain? Posted: 22 Feb 2017 01:27 AM PST I recently heard that humans are the only animals that can use ketone bodies (B-hydroxybutyrate) to fuel their brains and I was wondering if this was true. Are other primates capable of doing this? If yes, which ones? In either case, is there any understanding of when this mutation appeared in humans/primates? It seems like the ability to maintain mental acuity in a fasted/starved state would certainly be a useful at whatever point in our history we became meat eating hunters. [link] [comments]  |
| Is there a maximum length that a human hair can grow to? Posted: 21 Feb 2017 07:27 AM PST |
| Posted: 22 Feb 2017 04:14 AM PST *the longest living; *countries. Sorry, I was typing on the phone and I can't use Relay for posting questions on askscience [link] [comments]  |
| Ask Anything Wednesday - Biology, Chemistry, Neuroscience, Medicine, Psychology Posted: 22 Feb 2017 07:07 AM PST Welcome to our weekly feature, Ask Anything Wednesday - this week we are focusing on Biology, Chemistry, Neuroscience, Medicine, Psychology 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]  |
| Can you generate electricity from the earths magnetic field? Posted: 21 Feb 2017 03:16 PM PST This has always been a curiosity of mine. As people know, if you move a conductor through a magnetic field, a voltage is produced across the conductor and a current will flow as a result, all proportional to length of conductor, field strength, etc.. Classic generator theory. Now, this is where I'm confused. I'm pretty sure of my theory, but need some reddit advice! Here goes- The earths magnetic field runs north-south (or vice versa, I don't know), right? So, if you string up a long piece of wire in front of you spanning East-West, and dropped the wire parallel to the ground, will a voltage be produced on the ends of the conductor from the wire cutting through the earths magnetic field? I understand the energy produced will be absolutely miniscule at the most, but is my theory true? Ive thought of a couple concepts to aid with the efficiency by using an electronic compass to stay perpendicular and using sustainable kinetic energy for the movement of the conductor. But, really- ...Will it work? [link] [comments]  |
| Would earthquakes still be deadly without buildings and other man-made structures? Posted: 21 Feb 2017 08:32 AM PST |
| Is there a such thing as recurrent storms or blizzards that roughly occur every XX years? Posted: 21 Feb 2017 09:48 AM PST I've heard people say California is overdue for its 200 year storm. Does it work like that? Can weather be cyclical? Or is this superstition? [link] [comments]  |
| Is it theoretically possible to create a laser that emits radio waves? Posted: 21 Feb 2017 09:47 AM PST Can we, for instance, create a laser that emits radiation in the Citizen's Band as defined by the FCC (27 mhz)? [link] [comments]  |
| Posted: 21 Feb 2017 09:39 AM PST Surely if the kinetic energy of the system changes, then the velocities must have changed (obviously) and therefore the momentum must have changed. What am I missing here? Is it just an assumption to make calculations easier? [link] [comments]  |
| Why is the following wrong? (TL;DR I get i(pi)=0) Posted: 21 Feb 2017 11:02 AM PST We know, from Euler's identity, that ei(pi) =-1 If we take the natural log of both sides, we get i(pi)=ln(-1) Doubling both sides gives 2i(pi)=2ln(-1) Simplifying gives 2i(pi)=ln(1)=0 So, obviously incorrectly, 2i(pi)=0 So what has gone wrong here? Is it the fact I took a logarithm of a negative, or is some of my reasoning flawed? Is this finding Re(2i(pi)) by some roundabout method? Thanks in advance. [link] [comments]  |
| (Astronomy) If space is a vacuum, why is it so cold? Where does the temperature "come from?" Posted: 21 Feb 2017 09:47 PM PST |
| Is there a limit to the number of active Bluetooth connections in a confined space? Posted: 21 Feb 2017 06:10 AM PST |
| Why does an impedance mismatch cause reflected waves in transmission lines? Posted: 21 Feb 2017 08:51 AM PST When an RF transmission line is connected to a load whose impedance is not matched to the transmission line, there are reflections in the signal. A signal is reflected in the reverse direction of the source. How does the impedance mismatch cause the reflected signal? [link] [comments]  |
| How are molecules filtered by chirality? Posted: 21 Feb 2017 05:37 AM PST Example: Of breathing medicines, I heard Xopenex is a subset of Albuterol that lacks one of the chiralities, so Albuterol has that molecule and its mirror but Xopenex doesnt. One of the mirrors affects the lungs, and the other affects the heart. Xopenex is more expensive because of this. How did they filter it? It seems nonintuitive how a mirror molecule could be filtered since physics tends to do things symmetricly. [link] [comments]  |
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