We still do not know one thousandth of one percent of what nature has revealed to us.
I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.
Men marry women with the hope they will never change. Women marry men with the hope they will change. Invariably they are both disappointed.
The significant problems we face cannot be solved at the same level of thinking we were at when we created them.