Answer:
I love to dance and twist and prance. I shake my tail, as away I sail. Wingless I fly into the sky.
It is the great nemesis of the lactose intolerant.
I drift forever with the current down these long canals theyβve made, Tame, yet wild, I run elusive Multitasking to your aid. Before I came, the world was darker, colder, sometimes, rougher, true. But though I might make living easy, Iβm good at killing people too.
I have four wings but cannot fly. I never laugh and never cry. On the same spot always found, toiling away with little sound.
What can be seen but never found that only hides in the unwound?
I am your mother's brother's only brother in law. Who am I?