High school students (and brothers) Karthik & Rohit Chakravarthy (yes, Rohit, we do know which of you is the smarter one, and who the better looking) used their science fair project to innovate something useful beyond the confines of the convention center... a non-invasive test for atrial fibrillation!
Atrial fib is the most common form of heart arrhythmia, so, if spotted on a patient's ordinary check-up visit (rather than once they're having a heart attack or stroke), their tool can ensure that doctors and patients can take necessary steps to reduce their risks BEFORE a life-altering episode occurs.
Their method is currently being implemented in some of their local doctor's offices in Dayton, Ohio. With a hope to see their efforts spread, y'know, in that way that technology for the sake of humanity is beneficial :)
Nice work, guys.