Heaviside

Heav·i·side

[hev-ee-sahyd]
noun
Oliver, 1850–1925, English physicist.
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Heaviside (ˈhɛvɪˌsaɪd) [Click for IPA pronunciation guide]
 
n
Oliver. 1850--1925, English physicist. Independently of Kennelly, he predicted (1902) the existence of an ionized gaseous layer in the upper atmosphere (the Heaviside layer); he also contributed to telegraphy

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Heaviside is always a great word to know.
So is callithumpian. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
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