No spine 没有勇气，胆小鬼

　　Hit the book:

　　Adventurous

　　Towering

　　Penguin

　　Infectious

　　Immune system

　　Isolation

　　Pathogen

　　Simultaneously

　　For those who go, it's the trip of a lifetime – and it wouldn't be complete without a selfie with penguins. But growing tourism to the Antarctic, in combination with its warming climate, could be placing penguins at a risk of infectious disease