Riddle me this

1. I never was, am always to be,
None ever saw me, nor ever will,
And yet I am the confidence of all
Who live and breathe on this terrestrial ball.
--Anonymous

2. There is one that has a head without an eye,
And there's one that has an eye without a head.
You may find the answer if you try;
And when all is said,
Half the answer hangs upon a thread.
--Christina Rossetti

3. 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,
and at once on my birth I am dissolved into air.
--Anonymous, ancient Greece.

4. What we caught we threw away;
what we didn't catch, we kept.
--the riddle put to Homer by fishermen of Ios,
said to have caused his death.

5. I saw a restless shepherd travelling back and forth on his paths. He garbs himself in that which goes in the same and in an opposite direction. He goes hither and thither among creatures.
--From the Rig-Vega, a Hindu religious text

6. The age-old riddle of the Sphinx:
What goes on four legs in the morning, two legs at noon, and three legs in the evening?

so, anyone ??