There may be millions of civilizations out there, but the universe is so incomprehensibly vast that we might never be able to contact them and vice versa. And it’s also possible that every civilization inadvertently destroys itself before interstellar space travel can be achieved.
Which half? Please enlighten me.
the right half
I googled #7: TSE's- a group which includes mad cow disease (rabies and a couple of others are ~100% fatal)