How likely is a 21st-century epidemic of the plague? Unlike other diseases, the plague is alive and well in some parts of the world, but scientists and doctors are continuing to develop better treatments.

Hank gets real with us in a discussion of evolution - it's a thing, not a debate. Gene distribution changes over time, across successive generations, to give rise to diversity at every level of biological organization.

In this episode, we take a look at front line workers in the fight against Ebola, a Dengue virus epidemic in China and safe medicines for diarrhea and malaria.

Improper use of antibiotics can create strains of drug-resistant pathogens. Fourty-five thousand cases of multi-drug-resistant tuberculosis are found in the US each year. In one third of these cases, the patient dies. In Russia, at least...

TB is a moving target. It’s a complex, mutating virus that is appearing in hundreds of different, drug-resistant strains. There are 16 different vaccines now undergoing trials – but how will we know which will quickly be made ineffective...