At this week’s Carnival of Tomorrow.

At this week’s Carnival of Tomorrow.

At this week’s Carnival of Tomorrow.

A hundred and two years ago, the Wright brothers kicked off a new era of heavier-than-air flight. I wrote several pieces on the subject on the centennial.

Economist reports that video conferencing kinks are being worked out of both the experience and the business model. Corporations are getting on board. $1.75/minute on peak, $0.25 off peak? If it is being used “around the clock” as they say, average price would be only $0.50/minute or if only during business hours 40 hours/wk at $2/minute. Paying $3000 hard costs for four hours ($12.5/minute) of on site business meetings the past two days myself, I sure would like it if I could cut travel by 75%. The calculation is more extreme if you assign labor cost to travel. If you throw in my 16 hours of travel at $2/minute you get up to over $20/minute for these face-to-face meetings.

Control engineers would call this a runaway controller.

When the response to a change is to increase the change, rather than decrease it (which is what, for example, thermostats normally do), change happens very quickly, and uncontrollably. One of the issues with global warming is whether or not the feedback is positive, or negative. That is, does the warming result in even more warming, resulting in…or do things happen at higher temperatures that result in cooling?

One potential positive feedback might be that if glaciers and ice caps melt, the albedo of the planet decreases, which means that less energy is reflected back into space, which could result in further warming. In the other direction, if we are headed into a new glacial period despite the greenhouse effects (perhaps because solar activity dominates all else), then increasing snow cover makes things colder because more solar energy is rereflected, thus causing more cooling, and an accelerating glacial advance.

On the negative feedback side, though, it could be that more warming results in more clouds, which might in turn have the effect of cooling things off.

I suspect that the reality will be a combination of positive and negative feedback mechanisms, and it’s hard to know what the overall effect will be, though ultimately, it will be negative, but perhaps at a significantly higher (or lower) temperature. I’d be very surprised if the seas end up either boiling, or freezing solid.

From Slashdot readers. He has answers.

[Via Fred Kiesche]

[Update a couple minutes later]

I just realize in reading it that this is an old piece (from over a year ago), that I’d previously linked. Oh, well. It’s still a good read for any who haven’t read it.

Professor Henry Petroski has written many interesting books and essays on the art and limitations of engineering. Nick Schulz has a fascinating interview with him.

A new semi-conductor compound from Intel:

Intel says that replacing silicon with indium antimonide cuts power consumption by ten times while boosting performance by 50 per cent.

New chips employing it are still a decade off, though.

A new semi-conductor compound from Intel:

Intel says that replacing silicon with indium antimonide cuts power consumption by ten times while boosting performance by 50 per cent.

New chips employing it are still a decade off, though.