It cannot be seen, cannot be felt
Cannot be heard, cannot be smelt.
It lies behind stars and under hills,
And empty holes it fills.
It comes first and follows after,
Ends life, kills laughter.

My life can be measured in hours,
I serve by being devoured.
Thin, I am quick
Fat, I am slow
Wind is my foe.

What am I?

What five letters can you add "und" to - at the beginning and end - to create a common English word?
(und_____und)

I am an insect, and the first half of my name is the name of another insect.
What am I?

What English word retains the same pronunciation, even after you take away four of its five letters?

What gets wetter and wetter the more it dries?

Jim bought a bag of apples on Saturday, and he ate a third of them.
On Sunday he ate half of the remaining apples.
He ate one more on Monday and one more on Tuesday, then ate half of the remaining apples on Wednesday.
On Thursday he looked in the bag and saw that there was just one apple left.
How many apples did the bag have to begin with?

What has a mouth but can't chew?

Train A and train B are crossing the country, from coast to coast, over 3,000 miles of railroad track.
 Train A is going from east to west at 80 miles per hour, and Train B is going from west to east at 90 miles per hour.
Which train will be closer to the west coast when they meet?

How can you throw a ball as hard as you can and have it come back to you, even if it doesn't hit anything, there is nothing attached to it, and no one else catches or throws it?