Over the past few decades, transistors in computer chips have become progressively smaller and faster, allowing upwards of a billion individual transistors to be packed into a single circuit. But these circuits have an intractable design flaw: if a single transistor fails, the entire circuit fails. A Caltech researcher has been awarded a $6 million DARPA grant to develop self-healing circuits--which can detect, isolate, and fix their own flaws--to get around the problem.