Riddle

4: Granpa went for a walk, and it started raining, he forgot to bring an umbrella and didn't have a hat. But when he went home, not a hair on his head was wet, how???
4: Granpa went for a walk, and it started raining, he forgot to bring an umbrella and didn't have a hat. But when he went home, not a hair on his head was wet, how???
Riddle: People hate it, and celebrate when it's dead, it life can be long, but it can be short, what is it???