What goes up but never comes down?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

Count the number of times the letter "F" appears in the following paragraph:

FAY FRIED FIFTY POUNDS OF
SALTED FISH AND THREE POUNDS
OF DRY FENNEL FOR DINNER FOR
FORTY MEMBERS OF HER FATHER'S FAMILY.

Double it and multiply it by 4. Then divide it by 8 and you’ll have it once more. What number is it?

Find the hidden panda in the image below.

A boy was at a carnival and went to a booth where a man said to the boy, "If I write your exact weight on this piece of paper then you have to give me $50, but if I cannot, I will pay you $50." The boy looked around and saw no scale so he agrees, thinking no matter what the carny writes he'll just say he weighs more or less. In the end the boy ended up paying the man $50. How did the man win the bet?

Why do we preferably have round manhole covers and not square ones?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

Can you spot the man between the coffee bean in the picture below ?