Something that could be helpful for the world and not invented yet would be a baby scanner. what this scanner would do is you would go to the. doctors get scanned and the scanner would tell you of there is anything wrong with the baby. I think this would be helpful because in the future once you have your baby you know what needs to be done. like if it has a disability or something you could know ahead of time and know if it needs anything once it pops out. anything like surgeries, special treatment, or like strong medicine . the doctor would detect it and tell you what needs to be done. And throw in a time machine too. because people have lots of mistakes and stuff so they could go back in time and change it. but all the stuff and rules that apply in movies apply for the time machine also.