Riddle #962

Dipping, glinting, gliding by, Rainbow-fretted, wrought of breath. I live only while I fly – Earth’s rough kiss my sudden death.

Slayer of regrets, old and new, sought by many, found by few. What am I?

I drift forever with the current down these long canals they've 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, I'm good at killing people too.

To you, rude would I never be, Though I flag my tongue for all to see. What am I?

Die without me, Never thank me. Walk right through me, Never feel me. Always watching, Never speaking. Always lurking, Never seen.

You bury me when I am alive, and dig me up when I die. What am I?

What has roots as nobody sees, Is taller than trees, Up, up it goes And yet never grows?

I am a white box having no key or any lid. Yet there is a golden treasure inside it. What Am I ?

When you have me, you feel like sharing me. But, if you do share me, you don't have me. What am i?

Alive without breath, As cold as death; Never thirsty, ever drinking, All in mail never clinking.

At the sound of me, men may dream or stamp their feet. At the sound of me, women may laugh or sometimes weep.