I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

I can write cow in 13 letters.

Can You?

How many triangles can you find in this given picture?

Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den

Can you spot the man between the coffee bean in the picture below ?

A man is found hanging dead from the ceiling of a room. The room’s dimensions are 15 x 15 x 15. The man is only 6ft tall and the rope was only 2ft long. There are no windows and only one door to the room. The door is bolted shut from the inside, and a puddle of water is under the man. How did he kill himself?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

Rearrange the letters in "new door" to make one word.

Next Number in the Series,

5, 16, 49, 104, ?