Misc: In money circles what does ERM mean?

Questions

[General knowledge] which suburb of southwest london hosts the annual all englend lawn tennis championships?

[General knowledge] what are centenary, black star of africa andjubilee?

[General knowledge] what was invented in roughly 3,500 bc in mesopotamia?

[General knowledge] where can you find the oldest underground system in the world?

[General knowledge] what does RAM stand for?