Dear Science: Dirty bombs, dirty drugs and just... dirt

Allan Blackman joins us for another intriguing, mind blowing and informative segment of Dear Science. Allan discusses a new archeological discovery in northern Australia that suggests aboriginals have been living in australia for at least sixty five thousand years; we discuss the scary reality of radioactive warfare and dirty bombs following the fall of Mosul; finally we touch on ‘synthetic cannabis’ and how it's a dangerous misnomer.