I would like to create a time machine but it's going to cause a lot of problems and I'm very sure War would be started over it. 

I would create a permanent cure for cancer. 

I'm going to create a new weapon that's capable of giving someone a second life if death comes knocking. I mean that I'm going to create a weapon for immortality. 

I will create a new weapon that's going to give people second chance of living so far the person is still vibrant. I will also create a time machine that will take people back to the past so correct some mistakes or enjoy their pasts a bit.

If I had the ability and the know-how, I would love to create either a time machine or even a teleportation machine. 

Something I would love to be able to do it go to other places in the world quickly and even without spending a chunk of money to visit, that is where a teleportation machine would come in great! 

If I have an infinite intelligence and resources, I would create one thing with that knowledge and it's going to be a permanent cure for cancer. Cancer have killed so many people in the world more than AIDS. I need it gone from our world.