5.5 I'm getting worse. EDIT....If 18 is half German I'm claiming half a point....Give myself 6. Desperate stuff.
The answer to # 18 could also be German. Gutenberg also devised the measuring scale with Richter, but his name was never formally attached due to Gutenberg's dislike of being interviewed. The two worked together as seismologists at Caltech.
Nodding Donkeys / Pumpjacks can be used to extract any liquid. They are used on water wells in some locales.