Get a good look at the workings of the Keck Observatory atop atop Mauna Kea volcano in Hawai'i. I can't say I understand what's going on, but it sure looks impressive! The topper is the infinitely appropriate music that accompanies the action. -via Laughing Squid
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If you included medical/science terms it's over a million for the count in English. But current usage has us at 250k, not counting derivatives and historical words. If you include the full lexicon it's somewhere above 750k.