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A minimal surface is formed when the pressure on both sides of a surface is the same. 'For example, when you dip a bent coat hanger into soapy water, the soap bubble that forms on the hanger is a minimal surface.

Matthias Weber

OLEAGINOUS, adj. Oily, smooth, sleek. Disraeli once described the manner of Bishop Wilberforce as 'unctuous, oleaginous, saponaceous.' And the good prelate was ever afterward known as Soapy Sam. For every man there is something in the vocabulary that would stick to him like a second skin. His enemies have only to find it.

Ambrose Bierce