Architecture

• An Architectural Saddle Point in Tehran
• The Bridge of Peace in Tbilisi
• Dangerous Skyscrapers in London
• Fractal-like Architecture in Uzbekistan
• Japanese Carpentry
• Leaning Buildings
• Twisted Buildings

Art

• Patterns in a Turkmen Mosque
• Rates in Stand-Up Comedy
• Sidewalk Patterns in Yerevan
• Symmetry in Azerbaijani Carpets

Biology

• Estimating Penguin Populations
• Stromatolites
• Trends in Penguin Populations

Chemistry

• Dating Rock Art in Azerbaijan

Communications

• Underwater Communications Cables

Economics

• ATM Conversion Fees
• Black Market Exchange Rates
• Coins in Japan
• Currency Conversion Estimations
• Free Walking Tours in the Balkans
• Hyperinflation in Yugoslavia
• Pirates of the Argentine Sea
• Using an Abacus in an Unrecognized Country
• The Value of Frequent Flyer Miles

Environmental Sciences

• The Driest Place on Earth
• Venice Underwater
• Wind Chill Calculations
• Wind Forecasts and Vector Fields

Geography

• Curious Coordinates
• Loneliest Tree in the World
• Rescue Operations in Remote Regions
• Shrinking of the Aral Sea
• Steepest Street in the World?

History

• Depths of History in Bulgaria

Language

• Counting in Japanese
• Persian Numerals

Navigation

• Navigation Part 1: Map Projections
• Navigation Part 2: Latitude
• Navigation Part 3: Longitude
• Navigation Part 4: Magnetic Declination
• Navigation Part 5: Measuring a Ship's Speed
• Navigation Part 6: Dead Reckoning
• Rolling on a Ship

Physics

• The Beverly Clock
• The Solar System in Croatia
• Uzbekistan's Solar Furnace
• The World's Tallest Fountain