I am a stop sign, what you see in blood, a rose, and, of course, an Autumn leaf. What am I?

What shoes do frogs wear in the summer?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

What is in seasons, seconds, centuries, and minutes but not in decades, years or days?

A woman went to Virginia to get a job. She promised her mother she would come back and visit sometime. Then, in the middle of winter, her mother shouted, "April is here!". How is this possible?

What question can never be answered with a "Yes"?

David's birthday is in December, but it is never in the winter. Why?

What can pass before the sun without making a shadow?

How can 8 + 8 = 4?

In spring I am gay in handsome array; in summer more clothing I wear; when colder it grows I fling off my clothes; and in winter quite naked appear. What am I?

A man stands on one side of a river, his dog on the other. The man crosses the river, but the dog doesn't. How?

I fall but never get hurt, I cover the world in white, and disappear with a little warmth. What am I?

I run but never get tired. I flow but have no legs. I babble but have no mouth. What am I?