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Index of Subjects David & Alison Webster wrote: > Hi Eleanor, Aug 24, 2007 > I have not noticed any response to this question so will take a > stab at it, based on first principles. > > The Spider would be taking advantage of surface tension so would > presumably have hairs or pads of hairs on the 'feet' that are not > readily wet by water. At each of the 8 points of contact, the water > surface would be dimpled. The dimples under Water Striders can be seen > as optical effects in shallow water (I think); 4 (6?) dark blotches > with light haloes as an enlarged shadow of the surface dimples ? > > A typical used sewing needle has sufficient hand oils on the > surface to float briefly on calm water and the needle can be seen to > be floating in a depression. > Yt, DW, Kentville > > Eleanor Lindsay wrote: > >> While swimming in our cove yesterday I came eye to eye in mid-cove >> with a spider (body approx 0.4cm diameter) walking purposively up and >> down the small wavelets towards the shore - a considerable distance. >> How on earth does it do that with thread-thin, stick-like legs? >> >> Eleanor Lindsay, >> Seabright, St Margarets Bay >> > > > > Many thanks! Eleanor
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