A barrel of water weighs one hundred pounds someone puts something in the barrel and now it weighs sixty pounds. What did they put in the barrel.

I am what men love more than life, fear more than death or mortal strife, What dead men have and rich require. I'm what contented men desire

There’s a man inside of me I swear I did not eat, Though I do come from a carnivorous species that’s extinct I stole from Yankee Doodle a very catchy melody But despite the rumors, I’ve done no crime, I’m part of your family

I can be eaten but never spared. Drink too much and I’m all but dead. Sleep too much and I’ll lose my head. Eat too much and I scar to death.

I fade even though I'm cherished Sometimes I am all that is left But in modern times I am trapped. In card, in disks, in solid states.