Posted by Christian on Saturday, November 3, 2007 at 2:58pm.
Here are a number of interesting studies on twins and why they are important.
http://www.google.com/search?hl=en&ie=ISO-8859-1&q=the+importance+of+twin+studies&btnG=Google+Search
I searched Google under the key words "'twin studies' 'behavioral genetics'" to get these possible sources:
http://www.apa.org/monitor/apr04/second.html
http://www.personalityresearch.org/bg.html
http://en.wikipedia.org/wiki/Twin_study
http://www.aaas.org/spp/dser/02_Events/Lectures/2003/02_Lecture_2003_0410.pdf
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.
For your second question, I searched under "IQ effect poor rich homes":
http://the-mouse-trap.blogspot.com/2006/07/iq-variations-across-time-and-space.html
http://books.google.com/books?id=y6kviMXPHy0C&pg=PA316&lpg=PA316&dq=iq+effect+poor+rich+homes&source=web&ots=lWgaSgvOfA&sig=uSbCixnznPyq1_wZE_fpFRkkiaA#PPA3,M1
http://www.brendan-nyhan.com/blog/2006/07/revisiting_the_.html
http://www.huppi.com/kangaroo/L-intervention.htm
http://www.progressdaily.com/2006/07/25/nurture/
I hope this helps a little more. Thanks for asking.
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