Diseases that were largely eradicated in the United States a generation ago - whooping cough, measles, mumps - are returning, in part because nervous parents are skipping their children's shots. "Vaccines - Calling the Shots" takes viewers around the world to track epidemics, explore the science behind vaccinations and shed light on the risks of opting out. The program features scientists, pediatricians, psychologists, anthropologists and parents wrestling with vaccine-related questions.

NOVA Season 42 Episodes...

• s42e01 - Vaccines Calling the Shots
• s42e02 - Rise of the Hackers
• s42e03 - Why Planes Vanish
• s42e04 - Surviving Ebola
• s42e05 - Ben Franklin's Balloons
• s42e06 - First Air War
• s42e07 - Bigger Than T. rex
• s42e08 - Emperor's Ghost Army
• s42e09 - Killer Landslides
• s42e10 - First Man on the Moon
• s42e11 - Big Bang Machine
• s42e12 - Sunken Ship Rescue
• s42e13 - Sinkholes-Buried Alive
• s42e14 - Colosseum - Roman Death Trap
• s42e15 - Petra - Lost City of Stone
• s42e16 - Hagia Sophia: Istanbul's Ancient Mystery
• s42e17 - The Great Math Mystery
• s42e18 - Invisible Universe Revealed
• s42e19 - Nazi Attack on America
• s42e20 - Lethal Seas
• s42e21 - Chasing Pluto
• s42e22 - Nuclear Meltdown Disaster

NOVA Show Summary

Seen in more than 100 countries, NOVA is the most watched science based television series in the world and the most watched documentary series on PBS. It is also one of television's most acclaimed series, having won many major television awards, most of them many times over.