Answer:
This guy crossed a road and everyone wants an explanation.
I save lives on the ground and in the air. What am I?
Why are there no living cats on Mars?
If you drop me, I'm sure to crack. Give me a smile and I'll always smile back. What am I?
I have no wallet but I pay my way. I travel the world but in a corner I stay. What am I?
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.