Answer:
It is weightless, you can see it. If you put it in a barrel it will make it lighter?
Look into my face and I'm everybody. Scratch my back and I'm nobody.
What is seen in the middle of March and April that canβt be seen at the beginning or end of either month?
Some try to hide, some try to cheat. But time will show, we always will meet. Try as you might, to guess my name. I promise you'll know, when you I do claim.
I love to dance and twist and prance. I shake my tail, as away I sail. Wingless I fly into the sky.
You use it between your head and your toes, the more it works the thinner it grows.