Answer:
What can be measured but not seen?
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.
I go around in circles, but always straight ahead. Never complain, no matter where I am led.
Of no use to one, Bliss to two. Men lie for it. The babyโs right,
In the evening I'm long, in the morning I'm smallอพ When seen in a ballroom, I'm nothing at all.
Known for their natural tuxedos and marching.
Difficult
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?