Mei Li:
How often does a solar eclipse happens somewhere in the world??
Shuai Zheng:
every 18 months
Mei Li:
Pumba is what type of animal in the film 'The Lion King'??
Shuai Zheng:
warthog
Mei Li:
What potent plant is called technically Papaver somniferum??
Shuai Zheng:
opium poppy