Do You See It?

There is so small cabin inside a deep forest.
All the forest burned out to worst possible but the inside of the cabin is still the same.
However all the person inside the cabin die.

How come ?

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

Who am I?

I have two sand hourglasses:
1. A 7 minute one and
2. An 11-minute one.

Using just these 2 sand hourglasses, how can I measure time as 15 minutes?

You have a 12 liters jug full of water. You have two empty 8 liters and 5 liters jug. How can you divide the water into two equal parts using these jugs?

The more it dries, the wetter it becomes. Can you tell what it is?

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

He digs out tiny caves and stores gold and silver in them. He also built bridges of silver and made crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs his help, yet many people are afraid to let him help them. Who is he?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

In the image given, you can find several triangles. Can you count them all?