Answer:
What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?
Thanks for such treasures as Mariachis, enchiladas and habanero!
What can be measured but has no length, width or height?
What is used by man, tossed by trees, everywhere but unseen?
Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?
Special abilities and brightly colored underwear are all you need to be one of these.