Archive for January, 2011

How Differential Gear works

January 27, 2011

The 24 Hours of One Day In One Single Photo

January 27, 2011

Beautiful shot.

Ford Model T – 100 Years Later

January 20, 2011

Inspiring illustration of the value of specialization and coordination on productivity and wages. Via Cafe Hayek.

Why can’t we walk straight?

January 10, 2011

That’s a good question. But, thinking about it, it is not so surprising that we can’t walk straight (it is not easy to balance the body on two feet) as we have no sense dedicated to that purpose (and little need for one, evolution-wise).

What is more surprising is that it does not result in a random walk (some leaning left, some leaning right) but rather circular motions.

My guess is that the legs and feet are not sensitive enough to small variations in pressure, and if you start leaning to one side the additional pressure becomes the norm. Combine this with a dominant side, which may get tired after a while (therefore leading two counter-circles), and you get a plausible explanation. The next question is how to validate such a theory.

Happy Meals in San Francisco

January 9, 2011