Two high school juniors have made a lifesaving difference by designing an app that teaches people how to perform CPR.

Studies show that most people aren't comfortable when it comes to performing CPR. That's why twins Adeel and Amber Arif had the idea to make CPR training available to people on the one thing everyone knows best--their phones.

The twins developed an app that shows how to perform CPR. The girls even learned how to code and create the algorithm. The app screen goes green when CPR is done correctly and red when something is wrong.

Dr. Farrukh Jafri, of White Plains Hospital, is advising the twins on their project.

"I absolutely think it will make a difference," says Dr. Jafri.