inventions

Friedel Klussmann and San Francisco's Cable Cars

San Francisco’s cable cars are the last working system of their kind. The reason they haven’t been completely replaced by more modern modes of transportation is largely the advocacy of a woman named Friedel Klussmann.



A Condensed History of Air Conditioning

From hand fans to today’s high-end air conditioning technology, people have always found ways to deal with heat and humidity. And as mechanical cooling became more ubiquitous, some of the cultural practices for keeping cool were made obsolete. 



Five First Flights

When people say the Wright Brothers were first to fly, they're talking about a very particular set of circumstances. There are other contenders to the title of "first in flight," and each has their own compelling story and list of achievements.