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15 September 2007
- 23:1423:14, 15 September 2007 diff hist +86 Wikipedia:Reference desk/Science →Heart palpitations: new section
- 22:2722:27, 15 September 2007 diff hist +504 Wikipedia:Reference desk/Science →Circular oscilloscope time base: Yeah you're right
- 21:5021:50, 15 September 2007 diff hist +224 Wikipedia:Reference desk/Science →Circular oscilloscope time base: new section