I should also mention - stereo microscopes are fairly cheap - I got mine for about $500 brand new from the states. They're also more fun than (the more expensive) compound microscopes because you don't have to mess around with staining and preparing slides. You can just chuck anything you want under there, even live things like bugs, yet they're powerful enough to reveal cells and microscopic organisms.
Sorry, I'll stop evangelising on an *astronomy* group now :-D
Markus
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