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"Splashing" plays a central role in the transport of pollutants and the spread of diseases, but while the sight of a droplet striking and splashing off of a solid surface is a common experience, the actual physical ingredients and mechanisms involved in splashing aren't all that well understood.

On Valentine's Day, the sight of couples holding hands and exchanging kisses might unleash a wave of jealousy in those who are single.  But relationships — especially strained ones — can be bad for your health.