What goes up but never comes down?

A swan sits at the center of a perfectly circular lake. At an edge of the lake stands a ravenous monster waiting to devour the swan. The monster can not enter the water, but it will run around the circumference of the lake to try to catch the swan as soon as it reaches the shore. The monster moves at 4 times the speed of the swan, and it will always move in the direction along the shore that brings it closer to the swan the quickest. Both the swan and the the monster can change directions in an instant.
The swan knows that if it can reach the lake's shore without the monster right on top of it, it can instantly escape into the surrounding forest.

How can the swan successfully escape?

How many bananas can you eat if your stomach is empty?

Which five letter word can be added at the end of below word to form a
valid word?

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Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

I always drive my customer away.

Who am I?

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?

What does this Rebus Picture mean?

How many triangles can you find in this given picture?

Find the missing number in the image below.