Episode 132. Topic: Invading on ice. Theme: War. In 1658, Sweden invaded Denmark. It was also the coldest winter in recorded history. 

Episode 131. Topic: Why Sparta was so militaristic. Theme: War. Sparta, the city state in ancient Greece, was known for their extreme militaristic culture. Why was their society like that and how long did it last?

Episode 130. Topic: Pigeons. Theme: Navigation. Some of the best navigators in the world are pigeons. Why is this? How have pigeons played a major role in warfare? What else are pigeons used for?

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Episode 129. Topic: How sailing works. Theme: Navigation. How can someone sail a boat into the wind? You might be surprised to learn what sails a boat can fly a plane! 

Episode 128. Topic: Global positioning system. Theme: Navigation. How does GPS work? How many satellites are required and why is special relativity involved? 

Episode 127. Topic: The longitude problem. Theme: Navigation. Longitude is how far east and west of the prime meridian you are. Why for so long was this coordinate so difficult to correctly calculate? 

Episode 126. Topic: Celestial navigation. Theme: Navigation. How can you know where you are on the globe using the position of the sun or stars? 

Episode 125. Topic: Weather and war. Theme: Weather. Has the weather ever affected the outcome of a war? A battle? Has it potentially changed history? 

Episode 124. Topic: The Everest climbing window. Theme: Weather. Why do people only climb Mt. Everest in the same annual two week period? Do people ever climb off season? 

Episode 123. Topic: Getting struck by lightning. Theme: Weather. What does it mean to get struck by lightning? Is it fatal? How common is it and who has been struck the most?