A car that never needs maintenance or gas or oil or antifreeze
one pill/shot that gets rid of all of the incurable things out there (that people already have) like cancer,diabetes,the flu,the common cold,Alzheimer's Disease,personality disorders,mental disorders,STD's,etc-some kind of thing that prevents all the incurables if you have them and some kind of thing that prevents you from getting them if you don't-the same with animals
one pill/shot that prevents every kind of pain and suffering (before people get it) like you have when you are really sick,etc.
A way to make it legal for people to not have to work for all of the money that they need unless they choose to-but I'd have to think on that one cuz all the stores would go out of business
a special washer/dryer that you load the clothes in the washer and when they are done washing,they will automatically be put into the dryer and dry
There's so many more,but it would take me forever to type them..these are just a few