There are many instances in life where trial and error are the only way to arrive at new knowledge. There are also just as many (if not more) situations where reading labels, keeping your cool, and following instructions can save your life. I submit for your perusal three of the latter situations.
1. Read labels, and don't drink anything blue for God's sakes!
2. Microwaves are not going to kill you. Eating too many chips may.
3. Whooping cough is not endangered. Whooping cranes are. Know the difference.