Humpty Dumpty sat on a wall Humpty Dumpty had a great fall All the king's horses and all the king's men couldn't put Humpty together again

I can be an opportune moment Or a transparent and accessible form of ventilation I can also be a system that operates a device with ventilation and among other things can display and edit opportune moments

Born in the east where scholars made their mark, A silent skin for thought, from light to dark. I carry vows and wars, both truth and caper, Fold me, burn me, sign me, what am I?

I rode in wagons and waited by flame, Round as the moon, scorched with my name. I spoke in whistles when water was near, Calling the tired, the cold, the clear. From dawn’s first light to the last ember’s glow, I fed the trail with a steady pour.

As kids in schoolyards would often howl and say: what's black and white and red all over?