SETI is the organization that has attempted to answer the question by exploring the origin and prevalence of life in the cosmos Now, in a radio series, Are We Alone?,  SETI uncovers the science of life here on earth. Recent show topics include the world’s largest particle accelerator and neuroplasticity and the aging brain.

I came upon the site on the public science links at BlinkList.

At BlinkList, I can click on other topics and experts, make friends, and blink some great sites. I’m now trying out the tag cloud feature on my sidebar.