Fun Riddles

Question: How do you make the number one disappear by adding to it?

Question: Something different to show every week, but I'm still the same place.
If you're eating it's probably butter that you taste.

What am I?

Question: I am the only organ that named myself.What am I?

Question: Swallowing one is fine.
Swallowing two together is fine.
But Swallow them separately and all shall fall.

What are they?

Question: A king, queen, and two twins all lay in a large room.

How are there no adults in the room?