The analysis of a metal or other object to determine its strength or components. This is a tedious process, which is why it comes from the same root as "essay." An assay is to geologists what an essay is to an English major. That's some rock-solid knowledge there.
I'm not sure I can say that I know how hard this is because when I've "flown" RC helicopters, the flights have lasted less than ten seconds. They are ridiculously hard to fly. This is a fact of life. This man has not learned that fact:
Tareq Alsaadi, I salute you. That blew my mind within the first minute.
FlightVideoHelicoptersOn a stringJoysticksGo home, helicopter, you're drunkPeople who are better than you
Normally, we go with a video or music but this wacky story made us laugh this week:
During their visit, though, Audubon fed Rafinesque descriptions of American creatures, including 11 species of fish that never really existed. Rafinesque duly jotted them down in his notebook and later proffered those descriptions as evidence of new species. For 50 or so years, those 11 fish remained in the scientific record as real species, despite their very unusual features, including bulletproof (!) scales.