Personally I think using the metric system is more important for learning science than the instruction language. When you get down to it, the "simple Finnish words" are just as alien to everyday life as the Latino-Greek words. A word like "jännite" does not confer any more insight than "voltage". In advanced topics Finnish also uses loan words for things like electrons, momentum, grammatical cases and so on.

Also, in practice, most technical terms are borrowed from English, instead of inventing native, Finnish words for them.

For a more technical term, consider "democracy", which is "demokratia". The Greek roots are obvious.

It actually comes all the way from a Greek word that means "the Lord's," short for a term for churches that means "the assembly of the Lord" or "the house of the Lord."

http://www.etymonline.com/index.php?term=church

http://en.wikipedia.org/wiki/Christian_Church#Etymology

(Basis of knowledge: student of Biblical Greek, native speaker of English, sporadic student of various Germanic and Ugro-Altaic languages.)

The only etymology I could find is: kirkko [from Germanic. Compare Estonian kirik, Karelian kirikkö, Lapland girku, Swedish kyrka] : church

A quick scan of http://www.freeweb.hu/etymological/finnish.htm shows many words of Germanic origin. I like how "kihlat" (dowry) compares to the Swedish "gisslan" (hostage).

There's one example of the derivation:

'kirja' - 'book'

'kirjailija' - 'writer'

'kirjailla' - 'to embroider'

'kirjailu' - 'embroidery'

'kirjaimellinen' - 'literal'

'kirjaimellisesti' - 'literally'

'kirjaimisto' - 'alphabet'

'kirjain' - 'letter' (of the alphabet)

'kirjallinen' - 'written; literary'

'kirjallisuus' - 'literature'

'kirjaltaja' - 'typographer'

'kirjanen' - 'booklet'

'kirjasin' - 'font' (in typography)

'kirjasto' - 'library'

'kirjata' - 'to write down, to make a note of'

'kirje' - 'letter' (document)

'kirjeellinen' - 'by letter' (adj.)

'kirjelmä' - 'letter, note, message'

'kirjelmöidä' - 'to complain (by means of writing)'

'kirjoitella' - 'to write' (now and then)

'kirjoittaa' - 'to write'

'kirjoittaja' - 'writer' (person who performs a writing work)

'kirjoittaminen' - 'writing' (action)

'kirjoittautua' - 'to get enrolled, to log in'

'kirjoittelu' - 'writing' (now and then)

'kirjoitus' - 'writing' (result)

'kirjoituttaa' - 'to have ... written' (factitive of 'kirjoittaa')

'kirjuri' - 'scribe'

What about differences between languages in their ability to convey ideas.