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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.
Jul
10
answered Is Hydrogen gas present in biogas, and does it spontaneously ignite?
Jun
9
awarded  Supporter
Oct
7
awarded  Teacher
Oct
7
answered What gaseous substances do humans emit?
Jul
21
awarded  Editor
Jul
21
revised If body temperature is 37°C (98.6°F), why are most people more comfortable at around 21°C (70°F)?
Added link to article on human muscle efficiency
Jul
21
suggested suggested edit on If body temperature is 37°C (98.6°F), why are most people more comfortable at around 21°C (70°F)?