Baby Names Beginning With "R": Meaning: From the name RAPHAEL?

Questions

'papa doc' was president of which caribbean republic until his death in 1967?

haiphong is the third largest city in which south-east asian country?

in which city would you find tuff gong international studios, built by the late bob marley?

when is halley's comet next due to appear?

what term describes the study of the behaviour of materials and substances at very low temperatures?