Answer:
I am the noise Santa's reindeers make
I drift forever with the current and flows to your everyday life. I make living easy but I am good at killing people too.
I am the black child of a white father a wingless bird flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me even though there is no cause for grief and at once on my birth I am dissolved into air.
I repeat only the last word you say. The more I repeat, the softer I got. I cannot be seen but can be heard. What am I?
Until I am measured, I am not known. Yet, how you miss me when I have flown. What Am I?
A man goes out in heavy rain with nothing to protect him from it. His hair doesn't get wet. How does he do that?