What are some facts about Wormholes?

Like the black holes, worm holes are also such kind of 4D Space where the time slows up and the whole things will be in slow motion. Scientists are not actually sure what happens in there nor they've not find Wormholes! Stephen Hawking states that such place actually exist and so do I.He consider it as a time machine.As I told, the time on earth and the time in a wormhole is different, there's a possibility of time travel to the future. If we stay in a black hole for about 10 hours and come back to earth, the time passed on earth will almost be 10 years (the time differences may or may not be true as no investigations have took place based upon it) The same things happens even in Wormholes :-)