Buy me, smell me or deliver me, I do not change.

Who am I?

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

A sundial has the fewest moving parts of any timepiece. Which has the most?

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.

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

I am a five-letter word and people eat me. If you remove the first letter I become an energy form. If you remove the first two letters, I am needed to live. Scramble the last three letters and I am a drink. What word am I?

A bomb exploded in a room full of married couples and no one died. How?

What building has the most stories?

Can you write down eight eights so that they add up to one thousand?

Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?