Mei Li:
At 2015 how many people owned as much as the poorest half of the world's population (ie over 3billion people)??
Shuai Zheng:
62
Mei Li:
What colour is iodine vapour??
Shuai Zheng:
violet or purple
Mei Li:
With which planet do you associate Cassini's Division??
Shuai Zheng:
saturn