Spontaneous motion of oil droplet induced by surface tension difference. This is real time movie. The height of a step of glass stair is 1mm, the droplet size is 30 micro litter. The relative mass density of an il droplet is about 1.2, which is heavier than the aqueous phase whose relative mass density is almost 1.0. Nontheless, an oil droplet spontaneously climbs up stairs. Further detail is described in
http://sites.google.com/site/ysumino/home/movies/oilworm
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