Answer:
I always follow my brother but you cannot see me, only him. You cannot hear him but you can hear me. What are we?
I drift forever with the current down these long canals theyβve 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, Iβm good at killing people too.
My teeth are sharp, my back is straight, to cut things up it is my fate.
A mile from end to end, yet as close to as a friend. A precious commodity, freely given. Seen on the dead and on the living. Found on the rich, poor, short and tall, but shared among children most of all.
What has a spot and is very bright, is sometimes, red, white, blue, yellow or green and is often blinding.
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.