"Confocal" is a word in ENGLISH

confocal ENGLISH
Definition:

Having the same foci; as, confocal quadrics.

Few words of positivity

Social distance makes it all the easier to focus on small differences between groups and to put a negative spin on the ways of others and a positive spin on our own.

Daniel Goleman

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Laugh your heart out.

Q: Why did the blonde guy ask his girlfriend to squeeze his left testicle?A: Because the road sign said 'Squeeze Left.'

aberration ENGLISH

The convergence to different foci, by a lens or mirror, of rays of light emanating from one and the same …

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hyperbola ENGLISH

A curve formed by a section of a cone, when the cutting plane makes a greater angle with the base …

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umbilicus ENGLISH

One of foci of an ellipse, or other curve.

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