These things come to the top of my head:
1. None can be born without them.
2. They help protect us from danger.
3. They are often the first up in the morning.
4. They help determine if we are sick with the touch of a hand.
5. When brought to anger they may get hot and and flushed, but will always be there.
6. They often require a hat when it is too sunny or cold.
Basically there is much to be said about them. We truly can’t live without them.
So here’s to foreheads!