Improving life

I do have to agree with Rhett that a road that went downhill would be a good invention, and the other person that said it would be cool if a refridgerator, notice the d? Could spin, but what other things could we improve? It would be really cool if shampoo lasted forever so that you never needed to wash your hair! Also, if scientists created an animal that never....did it's buisness, had to be walked, and never shed or was hungry. Then, you'd have a cute companion that you never would need to take care of! That would be amazing! I'm a female, so it would be cool if  there was a swiss army knife for makeup! Pleeease tell me in the comments inventions that should be made or improvements that should be made for existing inventions!