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seen Dec 19 '13 at 21:30

Oct
1
comment Is evolution true as Darwin said?
@mgkrebbs - Great comment about ring species. Here's a nice explanation: pbs.org/wgbh/evolution/library/05/2/l_052_05.html
Sep
17
comment Changing the definition of life?
Drawing a clear line is difficult as you note. But science typically excludes viruses because they don't have the proteins and other parts necessary to reproduce or survive on their own. They contain the genetic code necessary to hijack the functional parts of cells in other organisms, but nothing else. Viruses don't follow chemical directions - they rely on the host cell to do that.