Things you always wanted to know the answer to [Vol. 3]
Discussion
Dr Jekyll said:
No, adaption was brought about by natural selection.
You're repeating yourself again.This definition is Wiki, top of page 1, Google search. Nice and easy to understand.
natural selection
noun BIOLOGY
The process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin, and it is now regarded as be the main process that brings about evolution.
OpulentBob said:
Stinkfoot said:
On this years Glastonbury hightlights, the drummers all appear to be behind a folding perspex screen ? Why ?
Assassination prevention. Or acoustic purposes.
One or the other.
popeyewhite said:
Dr Jekyll said:
No, adaption was brought about by natural selection.
You're repeating yourself again.This definition is Wiki, top of page 1, Google search. Nice and easy to understand.
natural selection
noun BIOLOGY
The process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin, and it is now regarded as be the main process that brings about evolution.
Ayahuasca said:
Do people drown from 'getting cramp', traditionally after ignoring advice not to swim after eating?
There is nothing to suggest there is an increased risk.The cold found in UK waters is more of an issue, cold water being classified as below 15 degrees celsius, so most of the UK's big bodies of water, for most of the year. I'm currently doing habituation training for my work in search and rescue by having cold showers at home, the idea being you get better at regulating your breathing when immersed in cold water, which is a real issue in the first minutes of immersion.
popeyewhite said:
Dr Jekyll said:
No, adaption was brought about by natural selection.
You're repeating yourself again.This definition is Wiki, top of page 1, Google search. Nice and easy to understand.
natural selection
noun BIOLOGY
The process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin, and it is now regarded as be the main process that brings about evolution.
An organism mutates, random chance etc, not as a result of the environment, but out of sheer luck. If that change happens to be beneficial, it might help and pass those genes on by natural selection.
Then, and only then, can you say the organism has adapted.
The environment doesn't force, create or drive individual changes, they have to come about by chance. Then comes selection, and through that preferential selection, the species can be described as adapting.
As for whether evolution still occurs due to human's mastery of the environment, yes that is still happening too.
Take for example drinking milk. The domestication of cattle is mankind taking control of the environment, and the genes for tolerating milk have been preferentially passed on until now most Europeans have it, although it is slightly rarer worldwide.
http://www.dailygalaxy.com/my_weblog/2009/10/the-p...
There's a gene that can provide disease resistance which appeared about 4000 years ago.
"Another recently discovered gene, CCR5, originated about 4,000 years ago and now exists in about 10 percent of the European population. It was discovered recently because it makes people resistant to HIV/AIDS. But its original value might have come from obstructing the pathway for smallpox."
The article also mentions a number of malaria resistant changes.
If you just consider disease resistance, you'll see that evolution can not be stopped.
Ayahuasca said:
Do people drown from 'getting cramp', traditionally after ignoring advice not to swim after eating?
Slightly aside, I once managed to turn up for my Sons swimming lesson an hour early by mistake - as ever he was hungry so I bought him a small plate of chips to keep him going whilst we waited. His coach spotted us and gave me an ear-full about eating an hour before swimming - I knew the whole cramp thing was up there with Swans breaking arms - but it seems it's not that - she told me that (kids especially) can vomit if they exert themselves too much after eating, plus if they eat something that doesn't agree with them, if they're going to throw up, they'll usually do so within the hour.
Apparently vomit in a swimming pool is a massive headache which means a time consuming, expensive clean-up job.
P-Jay said:
Slightly aside, I once managed to turn up for my Sons swimming lesson an hour early by mistake - as ever he was hungry so I bought him a small plate of chips to keep him going whilst we waited.
His coach spotted us and gave me an ear-full about eating an hour before swimming - I knew the whole cramp thing was up there with Swans breaking arms - but it seems it's not that - she told me that (kids especially) can vomit if they exert themselves too much after eating, plus if they eat something that doesn't agree with them, if they're going to throw up, they'll usually do so within the hour.
Apparently vomit in a swimming pool is a massive headache which means a time consuming, expensive clean-up job.
It usually requires a full drain and disinfectant. I'm sure your son wouldn't like it and they have to do the same to the pool too!His coach spotted us and gave me an ear-full about eating an hour before swimming - I knew the whole cramp thing was up there with Swans breaking arms - but it seems it's not that - she told me that (kids especially) can vomit if they exert themselves too much after eating, plus if they eat something that doesn't agree with them, if they're going to throw up, they'll usually do so within the hour.
Apparently vomit in a swimming pool is a massive headache which means a time consuming, expensive clean-up job.
I used to swim at a pretty decent standard as a schoolboy, competitions etc, and cramp from swimming just after eating is a real thing. It's the increased blood flow to the stomach to start the digestion process means compromised blood flow to arms and legs, less oxygen, and cramp.
Well that was the thinking in about 1977 when I was swimming. On the rare occasions I got cramp, I had always pushed the boundaries re eating before hand.
Well that was the thinking in about 1977 when I was swimming. On the rare occasions I got cramp, I had always pushed the boundaries re eating before hand.
TheEnd said:
It's almost as if you are arguing semantics here
I make a point, a poster disagrees because he doesn't understand that point, posts a rebuttal which basically agrees with my stance but uses different grammar, I suggest semantics, re-state my original point, and you accuse me of semantics, lol. TheEnd said:
An organism mutates, random chance etc, not as a result of the environment, but out of sheer luck.
"Natural selection occurs in response to environments" [see article below]Technological advances and unique biological characteristics allow us to adapt to environmental stress. Has this stopped genetic evolution?
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC332753...
TwigtheWonderkid said:
I used to swim at a pretty decent standard as a schoolboy, competitions etc, and cramp from swimming just after eating is a real thing. It's the increased blood flow to the stomach to start the digestion process means compromised blood flow to arms and legs, less oxygen, and cramp.
Well that was the thinking in about 1977 when I was swimming. On the rare occasions I got cramp, I had always pushed the boundaries re eating before hand.
The consequence of attempting hard physical exercise on a full stomach is vomiting and/or fainting as blood supply, as you point out, is diverted to muscle. Some people seem more prone to one or the other though IME. The need for oxygen delivery is more important than food digestion, so the system attempts balance by emptying the stomach. Cramp is a more specific-to-area-of muscle complaint, and some possible causes could be dehydration, lack of flexibilty, low electrolytes, tiredness, and low blood flow.Well that was the thinking in about 1977 when I was swimming. On the rare occasions I got cramp, I had always pushed the boundaries re eating before hand.
popeyewhite said:
TheEnd said:
It's almost as if you are arguing semantics here
I make a point, a poster disagrees because he doesn't understand that point, posts a rebuttal which basically agrees with my stance but uses different grammar, I suggest semantics, re-state my original point, and you accuse me of semantics, lol. TheEnd said:
An organism mutates, random chance etc, not as a result of the environment, but out of sheer luck.
"Natural selection occurs in response to environments" [see article below]Technological advances and unique biological characteristics allow us to adapt to environmental stress. Has this stopped genetic evolution?
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC332753...
Are you seriously suggesting that useful mutations arise as some kind of response to environmental change?
Dr Jekyll said:
popeyewhite said:
TheEnd said:
It's almost as if you are arguing semantics here
I make a point, a poster disagrees because he doesn't understand that point, posts a rebuttal which basically agrees with my stance but uses different grammar, I suggest semantics, re-state my original point, and you accuse me of semantics, lol. TheEnd said:
An organism mutates, random chance etc, not as a result of the environment, but out of sheer luck.
"Natural selection occurs in response to environments" [see article below]Technological advances and unique biological characteristics allow us to adapt to environmental stress. Has this stopped genetic evolution?
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC332753...
Are you seriously suggesting that useful mutations arise as some kind of response to environmental change?
MissChief said:
No, but selected mutations can be advantageous when environmental changes happen.
Of course, but that isn't what Popeye is saying. He reckons species say to themselves 'oh look the environment has changed and we don't have the technology to deal with it, better have some advantageous mutations' and that no advantageous human mutations can possibly arise any more.Dr Jekyll said:
Of course, but that isn't what Popeye is saying. He reckons species say to themselves 'oh look the environment has changed and we don't have the technology to deal with it, better have some advantageous mutations' and that no advantageous human mutations can possibly arise any more.
They don't even need to be advantageous, just so long as they are not disadvantageous they can spread widely into the gene pool.Stinkfoot said:
On this years Glastonbury hightlights, the drummers all appear to be behind a folding perspex screen ? Why ?
I may not have this 100% correct so musos; feel free to correct...Festival acoustics are generally awful; partly due to the open air nature and partly due to the fact that the band don't have the luxury of being able to do a sound check.Band members wear earpieces that take the feed directly from the mixer desk so they are hearing exactly what the audience hears and so each band member plays to that.
The problem is on stage, you 'feel' the drums as much as you would hear them and there a slight latency in the drum being hit and it then be heard through the player's earpiece so the effect is that the band slows itself down waiting for the latency to catch up which never comes. The screens remove or dull the 'pump' of the drums so the rest of the band plays to time.
I recall that Pete Townsend uses them as he has an issue with his hearing.
PS. What did the drummer get on his IQ test? Saliva.
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