[Phys-l] Bartlett and the exponential function (was Re: H. Sapiens)

[curtis osterhoudt <flutzpah@yahoo.com>]

I can't remember if this video has been discussed on this forum or not, but it's 
a fine example of good teaching, numeracy, and so on. I much prefer his 
black-and-white overhead transparencies to the fancy graphics someone has put 
together (he talked here at the Lab earlier this week, and at the Los Alamos 
Historical Society), but it's still clever pedagogy. 


http://www.youtube.com/watch?v=F-QA2rkpBSY

 /**************************************
"The four points of the compass be logic, knowledge, wisdom and the unknown. 
Some do bow in that final direction. Others advance upon it. To bow before the 
one is to lose sight of the three. I may submit to the unknown, but never to the 
unknowable." ~~Roger Zelazny, in "Lord of Light"
***************************************/




________________________________
From: curtis osterhoudt <flutzpah@yahoo.com>
To: Forum for Physics Educators <phys-l@carnot.physics.buffalo.edu>
Sent: Thu, September 16, 2010 11:22:43 AM
Subject: Re: [Phys-l] H. Sapiens

Remember the simple rule-of-thumb: If something is growing at x% per time y, the 

doubling time is roughly 70/x to double in y units. That is, a percentage growth 

rate of (say) 1% leads to a doubling of population in about 70 years. That's 
_scary_ to me, for _any_ population. 




/**************************************
"The four points of the compass be logic, knowledge, wisdom and the unknown. 
Some do bow in that final direction. Others advance upon it. To bow before the 
one is to lose sight of the three. I may submit to the unknown, but never to the 

unknowable." ~~Roger Zelazny, in "Lord of Light"
***************************************/




________________________________
From: Bernard Cleyet <bernardcleyet@redshift.com>
To: Forum for Physics Educators <phys-l@carnot.physics.buffalo.edu>
Sent: Thu, September 16, 2010 11:15:34 AM
Subject: Re: [Phys-l] H. Sapiens

Contrary to what I presume many think, Mexico is less adding to that problem:

"Throughout most of the twentieth century Mexico's population was characterized 
by rapid growth. Even though this tendency has been reverted and average annual 
population growth over the last five years was less than 1%, the demographic 
transition is still in progress, and Mexico still has a large cohort of youths."

http://en.wikipedia.org/wiki/Demographics_of_Mexico


bc


Demographic transition:

http://anthrocivitas.net/forum/showthread.php?t=1539




On 2010, Sep 11, , at 20:15, ludwik kowalski wrote:

> Actually, I was wrong about the "less than 20 years, as you can see at:
>
> http://en.wikipedia.org/wiki/World_population
>
> Ludwik
>
> = = = = = = = = = = = = = = = = = = = = = = = = = = =
>
> On Sep 11, 2010, at 11:05 PM, ludwik kowalski wrote:
>
> > On Sep 11, 2010, at 10:49 PM, brian whatcott wrote:
> >
> > > There are less than 8 billion people presently on Earth.  . . .
> >
> > This is about four times more than when I was a kid. It will probably double 
> > again in less than 20 years. How can one be optimistic about the future of 
> > sapients?
> >
> >
> > Ludwik
> >
> > http://csam.montclair.edu/~kowalski/life/intro.html
> >
> >
> >
> >
> > _______________________________________________
> > Forum for Physics Educators
> > Phys-l@carnot.physics.buffalo.edu
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>
> Ludwik
>
> http://csam.montclair.edu/~kowalski/life/intro.html
>
>
>
>
> _______________________________________________
> Forum for Physics Educators
> Phys-l@carnot.physics.buffalo.edu
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