There are many fossil finds documenting human evolution and hominin subspecies since our split from chimpanzees. What evidence do we have for chimpanzee evolution during this timeframe? |
- There are many fossil finds documenting human evolution and hominin subspecies since our split from chimpanzees. What evidence do we have for chimpanzee evolution during this timeframe?
- Are there diseases which can transfer from plants to animals?
- Why are cleft palates, which seems like a really specific condition, so common?
- Why arent't airplanes coating shaped as a golf ball since this expedient improve their aerodinamic?
- Does the brain use more energy when thinking about something difficult, or is it doing the same amount of activity, just more coordinated?
- Has there been a super-eruption (VEI 8) that did not result in a complete collapse of the volcano ?
- Can a linear dynamical system undergo a Hopf bifurcation?
- Why is that HSV is never truly eliminated by the body (compared to like flu and other viral illnesses)?
- Why can’t rockets take off from runways?
- Can a space craft abort re entry and then put itself back into orbit?
- Why is there a straight plume before the smoke of an extinguished candle expands and spreads out into the air?
- Why is Earth's core specifically high in radioactive elements? Shouldn't it mostly be iron, nickel, carbon, etc?
- Can anyone expand on aminoacyl-tRNA synthetases proofreading mechanisms?
| Posted: 12 Jun 2020 04:57 PM PDT |
| Are there diseases which can transfer from plants to animals? Posted: 13 Jun 2020 04:43 AM PDT There are quite a few diseases which can transfer from one type of animal to another. COVID-19 being one of them. This got me wondering, are there diseases which can transfer from plants to animals? [link] [comments]  |
| Why are cleft palates, which seems like a really specific condition, so common? Posted: 12 Jun 2020 04:26 PM PDT From what I can tell, many genetic and developmental disorders result in cleft palates. Considering that they are often caused by very different genetic problems, this seems like too specific a symptom. For instance, mutations that affect epigenetic marker adders and epigenetic marker erasers, respectively, both cause cleft palates. The problems are almost opposites, but the symptoms are the same? I can understand mental impairments being a symptom for many different diseases, because that's such a broad term and issue, with severity spread out on a large spectrum. Cleft palates and lips, however just seem so oddly specific. Is there a good explanation for this? [link] [comments]  |
| Why arent't airplanes coating shaped as a golf ball since this expedient improve their aerodinamic? Posted: 12 Jun 2020 09:56 PM PDT |
| Posted: 12 Jun 2020 02:41 PM PDT |
| Has there been a super-eruption (VEI 8) that did not result in a complete collapse of the volcano ? Posted: 12 Jun 2020 03:35 PM PDT Of all the super-eruptions I've read about, it caused the entire volcano to collapse into the caldera. Has there been a super-eruption that left some of the volcano standing ? If not, what was the largest eruption that did ? [link] [comments]  |
| Can a linear dynamical system undergo a Hopf bifurcation? Posted: 12 Jun 2020 12:55 PM PDT Another way to state the question: Can Hopf bifurcations exist without limit cycles? Conceptually I always see a Hopf bifurcation as having two main features: loss of stability of a fixed point and either the generation or loss of a limit cycle (stable/unstable for the sub/supercritical cases respectively). However, I usually see the Hopf bifurcation formally defined as a pair of complex conjugate eigenvalues crossing the imaginary axis. This formal definition suggests a linear system such as z'=(a+i)z (where z is complex) undergoes a Hopf bifurcation at a=0. However, linear systems cannot have limit cycles. Is the existence of a limit cycle required for a Hopf bifurcation? And if not, is the process of complex conjugate eigenvalues crossing the imaginary axis a sufficient condition to guarantee the presence of a limit cycle in a nonlinear system (i.e. can you have nonlinear systems which undergo a Hopf without the presence of a limit cycle, and if so why do we almost always see Hopf bifurcations alongside limit cycles)? My go to book for this type of thing is Kuznetsov's Elements of Applied Bifurcation Theory, which does address this linear case (Remark 4 in section 3.4), but I struggled to get a straight answer as to whether or not the linear case can actually be defined to undergo a Hopf bifurcation. Thanks for the help [link] [comments]  |
| Posted: 12 Jun 2020 09:40 PM PDT |
| Why can’t rockets take off from runways? Posted: 12 Jun 2020 06:57 AM PDT |
| Can a space craft abort re entry and then put itself back into orbit? Posted: 12 Jun 2020 02:07 PM PDT When space craft need to land, they do a de orbit burn. But is it possible for them to do another burn to place them back into orbit if need be, before they reach the point of no return on re entry? Is it possible on the shuttle / Soyuz? [link] [comments]  |
| Posted: 12 Jun 2020 09:15 AM PDT When extinguishing a candle, you can see there's a straight plume of sorts before the smoke dissipates higher up in the air. Why doesn't it dissipate/start whirling in the air straight away, instead of swirling a good bit higher than the flame? [link] [comments]  |
| Posted: 12 Jun 2020 02:52 AM PDT In addition to the first question, why isn't there as much radioactive material on thew surface as there is in the core? [link] [comments]  |
| Can anyone expand on aminoacyl-tRNA synthetases proofreading mechanisms? Posted: 11 Jun 2020 11:19 PM PDT I read that isoleucyl-tRNA synthetase has a second active site that performs an editing reaction if the wrong amino acid is to bind; like valine that is similar in size and differs only by a methyl group. I want to know how proofreading is done by aminoacyl-tRNA synthetases for other amino acids? Do larger ones like methionine and phenylalanine also have two active sites? Thanks !! [link] [comments]  |
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