Answer:
I have hands but cannot clap
I'm as simple as a circle worthless as a leader; but when I follow a group their strength increases tenfold. By myself I'm practically nothing.
I love to twist and dance. Though wingless, I fly high up into the sky. What am I?
If you drop me I'm sure to crack. But give me a smile and I'll always smile back.
I keep things green and keep kids happy during summer time.
Both old people and owls are said to be possessing this trait