On the Propagation of Constraints

It is often amazing how propagation of constraints from one situation to another results in non obvious connections between various aspects of the human condition. A few minutes ago, and still now, my granddaughter Willow has been joyfully carrying around a little shopping bag in it with various items. She comes to me about once a minute to add or subtract something from her bag. She has discovered the utility of bags, and probably learned the concept from some older female in her family.

So, what has this to do with the propagation of constraints ? A woman depends, in part, upon her physical attractiveness to others for survival or simply to have a good life. That simple and controvertible fact leads to constraints on the clothes she wears. The clothes must be attractive and favorably display her figure. This leads to the subsequent constraint that women's clothes seldom have as many pockets as men's clothes. A notable example is that men's shirts usually have a breast pocket on the left side, usually absent on women's clothes.

Similarly pockets on women's skirts are usually inconveniently on the front instead of on the side where they would interfere with display of her womanly hips. The net result of this is that women carry purses for their item carrying needs. In men's clothes, the pockets are their "purses." A follow on example of the utility of carrying capacity is the ancient tradition of basket making especially used in hunter-gatherer societies.

And so it comes to pass that my female grandchild is having fun today having joyfully discovered the utility of carrying capacity of some sort, all constrained by her future need to be attractive with that need conveyed to her by the habits of some older woman.

Legionnaire's Disease and Windshield washer fluid

Recent research indicates that use of windshield wiper fluid (mostly methanol) prevents Legionnaire's Disease from breeding in your wiper fluid compartment. In other words, do not use ordinary water.

Disaster Rescue ships

The recent earthquake disaster in Haiti deserves help and all should contribute what they can.

More generally, the world needs more disaster rescue ships. They should be of several types: hospital ships of multiple drafts for different harbors, emergency electrical power ships, communications ships in addition to whatever emergency communications might be standard on the other varieties of ships, emergency sanitation and shelter ships capable of deploying temporary sewerage and water systems and civil reconstruction vehicles such as bulldozers and cranes.

Rescue aircraft are also desirable, but they can do less because of the limited cargo capacity on devastated airfields. Most of the world's population is near the sea. Disaster aid by rail is also possible and it could be done by keeping modules ready for loading on flat-cars.

Skills

A human being should be able to change a diaper, plan an invasion, [...skill removed by blog poster], conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
--Heinlein, The Notebooks of Lazarus Long

This sort of goes with my feeling that we all need to hone our skills or develop new ones to aid us as the economy collapses. I just racked my second batch of pear wine today. I'm glad Guy knows how to make beer. I'm glad Jon has a machine shop and is good at farming. I think a good challenge for everyone who reads this blog would be to work on a new skill this year. What will it be?