Clever riddles with simple answers

You will throw me away when you want to use me. You will take me in when you don’t want to use me. What am I?

I have more than 80 keys, but I cannot open any lock. What Am I?

What loses its head in the morning but gets it back at night?

Alive as you but without breath, As cold in my life as in my death; Never a thirst though I always drink, Dressed in a mail but never a clink.

I don’t have eyes, ears, nose and tongue, but I can see, smell, hear and taste everything. What am I?

I run over fields and woods all day. Under the bed at night I sit, never alone. My tongue hangs out, up and to the rear, waiting to be filled in the morning. What am I?

What you cannot hold it but it is yours?

What runs around the house, but does not move?

It’s been around for millions of years, but it’s no more than a month old. What is it?

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.