They strike me as interview discussion questions not simple memorization. Take the numerous distance calculations. Great circle? Theoretical tunnel thru the

They strike me as interview discussion questions not simple memorization. Take the numerous distance calculations. Great circle? Theoretical tunnel thru the earth? Traditional maritime shipping routes or aircraft navigation routes which take into account prevailing winds and international boundaries etc? Oh so you produced a number which happens to be correct, here is a slide rule and the geographic coordinates I used, you can demonstrate spherical geometry to me now. Perhaps some ageism was involved although hard to tell if it was enforced to eliminate old people or young people, such as "deepest depth of the ocean". Data points that have stabilized in recent decades were not stable a century ago. How deep you think the ocean is depends a lot on when you learned how deep the ocean is, at least back then. http://en.wikipedia.org/wiki/Mariana_Trench http://en.wikipedia.org/wiki/Mariana_Trench