Brian Boyd, intelligence and law enforcement expert, offers insight into the ongoing investigation of the Nashville RV explosion on Christmas Day.

The clues that led to figuring out who the Austin bomber is, Facebook's Mark Zuckerberg admits to 'mistakes' with user data, and why mumps is on the rise.

What are investigators looking for in the Austin bombing case? Anti-Terror Expert Dr. Alex Del Carmen joins us with more.

Austin, Texas on edge after a string of package bombings, Republicans find no collusion with Russia, and where perfection could earn you $1 million a year for life.

Joseph Ax from Reuters breaks down how the New York subway attack shows limits of counterterror strategy.