Best Riddles and Answers

Question: 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.

What am I?

Question: Two men/women in absolutely identical conditions have two of the exact same water bottles (full of water). An hour passes, and the temperatures of the water inside the bottles are measured. The temperature of one of the bottles is noticeably higher than the temperature of the other. Assuming that the temperature of the setting they were in, as they were both the same, had to do with the change in temperature of the water, why are they different?

Question: What walks but doesn't have legs?

Question: I am somewhere but nowhere. What am I?

Question: How can twins be born in different years?