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?

What has no start, end, or centre?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

If 21x = 79x, what is the value of x?

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

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

You have four chains. Each chain has three links in it. Although it is difficult to cut the links, you wish to make a single loop with all 12 links. What is the fewest number of cuts you must make to accomplish this task?

Spot the cat in the picture below

Why is 6 afraid of 7?