Answer:
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.
To unravel me you need a simple key, no key that was made by locksmith's hand. But a key that only I will understand.
If I have it, I don't share it. If I share it, I don't have it. What is it?
What can be measured but not seen?
It's been around for millions of years, but is never more than a month old. What is it?
The strangest creature you'll ever find: Two eyes in front and many many more behind.