Problem: Now at 38 St Mary Axe, London, which 'exchange' started in a coffee house in 1744?
Answer: baltic exchange

Problem: Issei is a Japanese term used by Japanese in countries in North America, South America and Australia to describe what?
Answer: japanese people who were first to immigrate

Problem: Which naturalised American electrical/mechanical engineer and inventor (1856-1943) has given his name to the SI unit of magnetic flux density?
Answer: nikola tesla

Problem: What amorphous form of graphite or pure carbon is used mainly as a lubricant for machinery?
Answer:
blacklead