Dreampanther
We all face the reaper.
I don't think there are any unselfish deeds. If you join your wife at the theatre, even though you hate it, it is not because you are unselfish, it is because you know she is going to make your life a living hell for the next month because "you don't love me, and we never do things together, and we always do what you want to do, blah. blah. blah."
If you give your shoes (your very old, worn out shoes that you were planning to get rid of anyway) to a bag lady, it is not because you are unselfish, it is because you were raised in a society that encourages charity and because in chuch you were taught if you don't help the needy, you are going to hell.
For every unselfish act you care to name, I could show you how it is actually in your own interest, even if you don't consciously realise it. Sometime it is long-term reward for short-term loss, but it is always for your own benefit, even if it is only to soothe your conscience (which is a social construct, by the way).
I think you are all missing the point, however. Heroism has nothing to do with charity or unselfishness. In fact, many heroes were glory-seekers, seeking fame and fortune. Again, that is besides the point. The point is, heroism is about fear.
You are a hero when you can conquer your fear. When you jump into a raging river to save a child, even though you are scared you might drown, you are a hero. If you are a Navy SEAL, with years of training and specialised equipment and stacks of experience, it is just another job, and you are probably thinking to yourself "oh God, another freaking idiot I have to save."
It is only when you are so scared you can taste the fear, you wanna pee in your pants and you would run away but your legs are shaking too much, that the question of courage or heroism comes up. Heroism is about conquering your fear, doing what you know is the right thing to do even though you are so scared you are nearly paralysed. A man who climbs a mountain for fun and rescues trapped travellers is certainly doing a good deed. But a man who has a fear of heights and climbs a little old tree to save a cat is a hero.