Bachelor and Licenciate at Biological Sciences from Universidade de São Paulo, Master and PhD at Psychobiology from Universidade Federal de São Paulo.
sleep & dreams & memory & forgetting
To live is to dream
16:31 Posted: Jan 2011
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23:34 Posted: Oct 2007
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A reply on Talk: Peter Saul: Let’s talk about dying
A reply on Talk: Peter Saul: Let’s talk about dying
A reply on Talk: Peter Saul: Let’s talk about dying
A reply on Talk: Frans de Waal: Moral behavior in animals
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A comment on Conversation: Quais os novos desafios para a educação formal em uma nova economia colaborativa?
http://www.ted.com/talks/salman_khan_let_s_use_video_to_reinvent_education.html
A comment on Conversation: [Spanish-Español] Si se recibiera una señal de inteligencia extra terrestre ¿deberÃamos responder? ¿qué deberÃamos decir?
A comment on Conversation: Should the internet be a fundamental right?
* (1) Everyone has the right freely to participate in the cultural life of the community, to enjoy the arts and to share in scientific advancement and its benefits.
* (2) Everyone has the right to the protection of the moral and material interests resulting from any scientific, literary or artistic production of which he is the author.
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A reply on Talk: Nina Jablonski breaks the illusion of skin color
A possible explanation for your first question is that our ozone layer is currently at risk, thus allowing high UV levels to irradiate on people, causing high risk of skin cancer amongst low pigmented people and low risk of rickets amongst high pigmented people. Of course, the selection pressure is not evident nowadays as we can overcome the aforementioned risks with several artificial means at hand (i.e.sunscreen and vitamin D supplements).
As for your second issue, there is evidence that modern lifestyle and excessive use of sunscreen might have lead to recent increase of ricket cases amongst low pigmented children.
Finally, the historical case for rickets in UK might have been caused by air pollution from smoke produced by burning coal during Industrial Revolution.
A few references:
www.ktradionetwork.com/health/sunscreen-causing-rickets-in-middle-class-english-children/
www.ncbi.nlm.nih.gov/pubmed/16995805
A comment on Talk: Cynthia Breazeal: The rise of personal robots