Author: Dr. John Lienhard

Episode: 1459 A tongue-tied attempt to say what teaching is.  Today, teaching and ambiguity.

Episode: 1458 The brief bright day of the electric trolley in Houston.  Today, let's ride the Houston trolley.

Episode: 1457 Eratosthenes's 2200 year old calculation of Earth's size.  Today, we measure the earth.

Episode: 1456 In which paper goes from China to Europe by way of Samarkand.  Today, paper makes a long journey.

Episode: 1455 A brief history of dentistry and pain.  Today, we drill teeth.

Episode: 1454 The sometimes astonishing results of juxtaposing contradictory ideas.  Today, a thought about juxtaposition and contradictions.

Episode: 3332 From DC Dynamo to AC Alternator.  Today, the dynamo.

Episode: 1453 Christiaan and Constantijn Huygens, and John Donne.  Today, a tale of two Huygens and John Donne.

Episode: 1451 Inventing the free public lending library: socialism in books.  Today, we invent the library.

Episode: 3331 Some thoughts about photography and reality.  Today, Let’s take pictures.