pavelcherepan

24 minutes ago, Sensei said:

Nationalists, racists, sexists etc. are teaching their children to behave the same like them.. To hate people from some other groups..

Sensei, I'm confused as to how this relates to the question in the OP?

Don't confuse happiness with sexual arousal. Also, happiness is not a physiological effect and it's, therefore, hard to speculate on whether or not it's hard-wired in the DNA. But overall, a lot of positive emotions come as a result of dopamine and other neurotransmitters being released into the system often as a result of performing whatever action that's considered beneficial to the survival of the organism and/or spread of it's genetic information.

These responses potentially can be modified on a genetic level to come as a result of different actions, but I'm not entirely sure as to how much the science has progressed in this regard.

As far as I understand it, the orbit of a planet will always have the same focus and directrix, with the caveat that the entire ellipse may in fact rotate about the focus due to GR effects.

14 hours ago, John Harmonic said:

I am wondering if I tick all these boxes, how long it will take to evolve into stronger faster and physically superior human beings?

A very-very long time. If I were you, I'd put my chips on epigenetics 

In English please... and why is this in News section?

Most of such important servers are not connected to the internet and the only way to hack into one is to physically be there.

And if it is connected to the network, then as is with most cracking, social engineering methods should be some of the best to use, but I can't be sure, your question is too vague.

3 hours ago, mistermack said:

But that's in a car, where they get very little use

I agree with what you wrote, except this ^. 

Every time a spark plug discharges somewhere between 12-45 kV, it takes the energy directly from the battery which is then recharged by alternator. Therefore, battery gets a lot of use, it has to supply energy to every spark plug many times per second and keep recharging as well. It gets pretty busy.

10 hours ago, StringJunky said:

What  changes internally  in a growth  - like an intestinal adenoma (pre-cancer) for example - that makes it malignant? Or why does increasing size mean it increases the chances of it becoming metastatic? Does the already disfunctioning cells increase in disorder in their DNA with each new replication or new generation?

As far as I understand it, the increase in size of a benign tumor simply increases chances of further random mutations which will eventually allow one to become malignant. Benign tumor cells usually have developed a mutation which allows them to multiply uncontrollably, but can still be contained by the actions of immune system. At the same time this uncontrolled replication increases the chances of further mutations coming along which will alter some of the genes relating to immune response, such as being able to evade natural killer cells. 

https://en.wikipedia.org/wiki/Natural_killer_cell#NK_cell_evasion_by_tumor_cells

From that point on, you get a malignant tumor.

Ground/surface waters washing away the foundation?

13 minutes ago, Ray Kay said:

Its is often stated that we share 98.7 percent of our DNA with chimpanazees which appears to be rejected now (not in the sense the data wrong, however that the method used wasn't the best). I found in this article that we share 95% https://www.scientificamerican.com/article/what-does-the-fact-that-w/ yet on another 96% https://www.ft.com/content/43445728-1a44-11da-b279-00000e2511c8 and even other estimates on other websites. Is there an agreed upon percentage among geneticist as to how much DNA we share with chimpanzees?

It is not as simple as just saying "we share 96% of our genes". It matters really not just how many changes there are in total, but what changes do in fact alter the phenotype. The % difference in on itself doesn't really tell us much at all when comparing different species. It is mostly useful for genetic testing of parenting, since here we are comparing DNA of two individuals of the same species:

Quote

The alignable sequences within genomes of humans and chimpanzees differ by about 35 million single-nucleotide substitutions. Additionally about 3% of the complete genomes differ by deletions, insertions and duplications.^[12]

Since mutation rate is relatively constant, roughly one half of these changes occurred in the human lineage. Only a very tiny fraction of those fixed differences gave rise to the different phenotypes of humans and chimpanzees and finding those is a great challenge. The vast majority of the differences are neutral and do not affect the phenotype.

https://en.wikipedia.org/wiki/Human_evolutionary_genetics

13 hours ago, SmileTheory said:

1. Dopamine correlate with latitude.

2. Brain fertliser levels (bdnf) correlate with gravity strength. Bdnf is contractile inducible  so gravity will increase antigravity muscle contraction and release of bdnf.  Bdnf is also highly heritable, so.....

Correlation ≠ causation. You'll need some proof that the causation exists. You can't base a theory on correlation. 

26 minutes ago, studiot said:

In tennis, by contrast, the opponent may strike the ball before it bounces (in badminton he must) so can take the opportunity to find a direct line to the target area.
This usually occurs to a high ball and the smash stroke can get right on top of it, driving it hard down so that it bounces very fast back (or sideways) from its strike of the target area out of reach of the opponent.
The direct line to smash back may well not occur until the ball is well into the crowd.
So tennis smashes are difficult to return, let alone to smash back.

The way Prashant has been describing the situation, a strong shot from the back line would also be considered a "smash". Let's not forget about the weight of the projectile here. In table tennis the ball is very light and even though subjected to severe drag, in a short distance to opponent's side it travels essentially in a straight line. It is, therefore, necessary in order to perform the strongest possible shot to hit when the ball is above the level of the net.

In tennis the ball is significantly heavier and, when hit from the back line will travel on a ballistic trajectory even when hit with the maximum force. Hence, it's possible to perform the strongest shot even when the ball is below the level of the net provided that there is sufficient distance to target.

It is easier in table tennis, I don't argue this point, but returning smash is very much possible in lawn tennis, especially when the play is done on "slow" surface, especially grass, which allows players more time to get to the ball after opponent's shot.

6 minutes ago, prashantakerkar said:

Smash means hitting the table tennis ball hard on the opposite side of the table i.e opponent so that it cannot be returned back.

This (highlighted) makes no sense. If for smash you need to hit such that the ball or the shuttlecock can't be returned back, then you can't have returned smashes in any of those games.

If, on the other hand, you are referring to simply a very strong shot, then can return "smashes" in each and every game you mentioned. Just watch some high-level badminton or tennis play, especially if you look at some masters of back line play like Andre Agassi. 

2 hours ago, SmileTheory said:

A planet's gravitational field fluctuates depending upon distance from the equator.  Gravity is weaker at the equator and strengthens with distance from the equator towards the poles.  Dopamine levels follow a latitudinal gradient, with humans having higher levels further from the equator.  These higher dopamine levels are paired with larger eyes and visual cortices in humans at higher latitudes. 

Or it can be linked to dozens other factors that change when moving from the equator towards the poles. What is your proof that it's related to gravity? If, for example we took a person who was born and lived all life at equatorial region and sent them to live in Canada, would that result in an increase of dopamine levels? Has this been tested?

2 hours ago, SmileTheory said:

The discovery of a hidden cross cultural sign languge linked to manipulating (touching) facial muscle groups i.e touching the chin signifies 'why?'.  Each muscle group is linked to a different context.

First time I've heard that touching my chin means asking "why". I'd love to see the reference for this study.

2 hours ago, SmileTheory said:

The human face is increasingly evolving to resemble the delight facial expression.  This is a highly adaptive outward appearance referred to as beauty.

Proof or it didn't happen.

Define "smash" please. If you're using the term as it is used in lawn tennis, i.e. a shot that is hit above hitter's head, then this:

1 hour ago, prashantakerkar said:

Table tennis players return smashes with smashes many times.

Is not really the case. And this:

1 hour ago, prashantakerkar said:

2 Lawn tennis :

Lawn tennis players cannot return smashes with smashes.

Reason : 

is just wrong. There's no reason it can't be done.

1 hour ago, prashantakerkar said:

3 Badminton : 

Badminton players cannot return smashes with smashes.

Reason : 

This one is correct for a simple reason - in badminton the shuttlecock is not allowed to hit the play court, so it can't bounce up.

1 hour ago, Markus Hanke said:

It should also be remembered that mass arises from a quantum field’s interaction with the Higgs field, so in some sense it isn’t actually an intrinsic, isolated property at all. Prior to electroweak symmetry breaking, all elementary particles were massless.

Are you certain that electrons interact with Higgs field? I thought it was mostly for gauge bosons.

2 minutes ago, Shikkei said:

It's to make nitric acid. The nitrate salt is yellow in colour. 

Which salt? There are many nitrate salts.

1 minute ago, Shikkei said:

Thanks! But im looking specifically for nitrate salts though. 

Ammonium nitrate is a nitrate salt though - (NH₄)(NO₃)

Actually, come to think of it, depending on your area of residence, buying it might require a license as it can be used to make explosives.

Ammonium nitrate is a rather common fertilizer. Most gardening shops will have some form of it.

7 hours ago, MigL said:

Soooooo...

Reality is subjective ?
Everyone experiences a different reality ?
There is no reality unless someone is there to experience it ?

Are we heading towards solipsism then?

2 minutes ago, YaDinghus said:

You call that winter?

Australian winter, not a proper cold one, but then on the other hand, houses in Australia have absolutely garbage insulation.

7 minutes ago, YaDinghus said:

What's the outside temperature where you're at?

Depends on time of day of course. Between 4 degrees C and maybe 15 degrees on a good day.

45 minutes ago, YaDinghus said:

After all it has to account for the observations we've already made

Of course but space in classical mechanics and GR are radically different even though GR accounts for same observations plus some on top.

1 minute ago, John Cuthber said:

Incidentally, do you have air con + can it be reversed?

I have evaporative cooling for summer and gas ducted heating for winter.

It is winter in Australia so heating and bills for it is on everyone's mind.

I was just trying to decide what method of keeping my house at reasonable temperature would be the best.

Suppose the total volume of heated premises is around 550 cubic meters, and if gas ducted heating is turned off, it cools down from 20 to 17 degrees in about 2 hours.

I could either turn heating on in short bursts getting the temperature up to around 22 degrees and then turning it off for a couple hours until it drops to 19-20. Otherwise, I could just keep heating constantly on at 19 or 20 degrees.

Which method is more efficient?