I know how to build a fourth dimensional time machine.
I have a trans-dimensional device in my left pocket that can turn the entire universe into light, love and eternal grooviness, but I don't feel like using it. Why? Well, I have a time machine in my right pocket and when I'm done teaching my dog the answer to life, the universe and everything I'm going to use it to go 100 billion years into the future. Why? I just want to see what's up.
Where will we all be in 100 billion years?