Problem: Text: Countercurrent exchange is a mechanism occurring in nature and mimicked in industry and engineering, in which there is a crossover of some property, usually heat or some component, between two flowing bodies flowing in opposite directions to each other. The flowing bodies can be liquids, gases, or even solid powders, or any combination of those. For example, in a distillation column, the vapors bubble up through the downward flowing liquid while exchanging both heat and mass.

Question: in a countercurrent exchange system the fluids in two tubes flow in opposite directions?

OPTIONS:
- no
- yes
A: yes

Problem: Text: Because the American title was different, all scenes that mention the philosopher's stone by name had to be re-shot, once with the actors saying ''philosopher's'' and once with ''sorcerer's''. The children filmed for four hours and then did three hours of schoolwork. They developed a liking for fake facial injuries from the makeup staff. Radcliffe was initially meant to wear green contact lenses as his eyes are blue, and not green like Harry's, but the lenses gave Radcliffe extreme irritation. Upon consultation with Rowling, it was agreed that Harry could have blue eyes.

Question: do they say sorcerer's stone in the movie?

OPTIONS:
- no
- yes
A: yes

Problem: Text: Since 22 February 2017, New Hampshire is a constitutional carry state, requiring no license to open carry or concealed carry a firearm in public. Concealed carry permits are still issued for purposes of reciprocity with other states.

Question: do you need a concealed carry permit in nh?

OPTIONS:
- no
- yes
A:
no