some words

exhilarating: estimulante

knocking: golpes, golpeteo

grin: sonrisa

smug: presumido

superb: magnífico, espléndido

murky: (murkier, murkiest)
(casa, pasado) oscuro,-a, tenebroso,-a
(agua) turbio,-a, sucio,-a
murky water, agua sucia

butcher: carnicero

baker: panadero

canny: adjetivo inteligente, astuto

feurebach

I was reading a manual LaTeX and found a word not seen before "feuerbach"

In the picture, a triangle is drawn with the inscribed and the circumscribed circle (solid), the three adjacent circles (dashed), and the nine point (Feuerbach) circle (dotted).

wrapped butterfly

In the same article says: In this paper, we determine the complete spectra (eigenvalues and multiplicities) of wrapped butterfly digraphs.

I do not understand "wrapped butterfly"

butterfly digraph & butterfly network

I was reading an article, "butterfly digraph" and "butterfly network", both are keywords but I do not understand

I read http://xkcd.com/123/ but do not understand everything :S

I not know as put the image, David explain me please.

no entendí nada

He was an especially trenchant critic of the incorregible American tendency to Political Correctness, whether of Left or Right, and the substance of Main Street is an amusing and often deadly account of one young woman's struggle with the idols of the contemporary bourgeois tribe - in this case good housekeeping, male superiority, intellectual nullity and the Grand Old Republican Party.

haber si alguien me puede ayudar

elderly

"mayor de edad"... "she was also elderly, safely out of the way in Europe"...