There are thousands of alien races in the whole world, and it seems that just now humans can confirm that. In this world, the aliens have conscience and emotions. Just very different from humans. They are mostly cruel. They are very curious about humans. But all the things related to humans are some of the most toxic things and harmfull to specifc aliens. Water is the top 1 most dangerous thing known (not for humans) and Alcohol would be the 2th. And many others after.