Toucan Beaks

Most engineering that people are familiar with is accomplished by engineers with an understanding of the science underlying their discipline. They use that understanding to determine how to approach the problem they’re solving. Most of the time there are multiple possibilities — for example, there are many ways to build a 100 foot long bridge — and engineers use other factors (cost, aesthetics, experience, etc.) to choose amongst the possible approaches. This science-driven engineering is what we’re used to, but it is not empirical engineering. It is enabled by our accumulated scientific understanding, and by our human ability to apply that understanding to solve a problem.

However, science-driven engineering is not the only kind of engineering. Empirical engineering is accomplished by trying solutions over and over again, trying to improve the result each time. Empirical engineers don’t understand the whys and wherefores of what they’re doing; they just try things to see if they work — and when they do, they remember it, incorporate it in their design, and move on to the next empirical engineering optimization.

A few years ago, I read of a very good example of empirical engineering by humans: the Roman’s development of catapults, trebuchets, and the like (weapons that hurl large weights). The Romans who designed these machines had zero understanding of the science underlying the mechanics and physics of what they were building — and yet, over time, the machines they designed evolved into designs that a modern engineer (similarly restricted in choice of materials) would be proud of. The really interesting part of this example is that there is quite a good history of the Roman weapons' development over time — so archaeologists have been able to recreate an approximate history of their empirical engineering.

A few lines ago, I used a phrase ("and yet, over time, the machines they designed evolved into designs that a modern engineer would be proud of") that ought to give you a little mental nudge — because that phrase describes the process of biological evolution quite nicely. Biological evolution is the ultimate in empirical engineering. Here’s a great example of that:

From UCSD’s Jacobs School of Engineering:

In a paper to be published Dec. 1 in Acta Materialia, Meyers and graduate students Yasuaki Seki and Matthew S. Schneider reported that the secret to the toucan beak’s lightweight strength is an unusual bio-composite. The interior of the beak is rigid “foam” made of bony fibers and drum-like membranes sandwiched between outer layers of keratin, the protein that makes up fingernails, hair, and horn. Just as the hook-shaped barbs on cockleburs inspired the development of Velcro, Meyers said the avian bio-composite could inspire the design of ultra-light aircraft and vehicle components with synthetic foams made with metals and polymers.

"The big surprise was our finding that the beak’s sandwich structure also behaves as a high energy impact-absorption system,” said Meyers. “Panels that mimic toucan beaks may offer better protection to motorists involved in crashes."

Read the whole thing!

Creationists (using the term very loosely) have trouble imagining that something like the toucan’s beak could develop through evolution. After debating many of these folks, I think there are two things (other than pure blind faith) that drive the trouble they have: one is their incomprehension of the amount of time available for evolution to have occurred, and the other is their incomprehension of empirical engineering. I’m not at all sure how to solve these problems <smile>, but I have had some success in debating creationists by raising the topics. There are abundant examples of empirical engineering all around us, so simple and obvious that absolutely anyone could understand them (I’ve used the example of the Roman’s weapons many times; their bridge-building is equally good). The concept of the passage of millions or even billions of years is more challenging to communicate — especially if the person you’re debating is of the fundamentalist persuasion and is convinced that the Earth is only a few thousand years old…

A tip of the hat to GrrlScientist at “Living the Scientific Life” for the pointer to the article in her most recent Birds in the News post. If you’re at all interested in birds, and you’re not familar with her blog, check it out — she does a wonderful job of presenting all kinds of news about birds…

Moons of Saturn

The Cassini robotic spacecraft orbiting around Saturn turns in marvelous science data day after day. The Cassini team also took the trouble to chart when the spacecraft happened to be in places where particularly spectacular pictures could be taken — without regard to their scientific value — and made time in the schedule to take those pictures. This is one of those images.

From the official Cassini-Huygens web site:

In a rare moment, the Cassini spacecraft captured this enduring portrait of a near-alignment of four of Saturn’s restless moons. Timing is critical when trying to capture a view of multiple bodies, like this one. All four of the moons seen here were on the far side of the rings from the spacecraft when this image was taken; and about an hour later, all four had disappeared behind Saturn.

Seen here are Titan (5,150 kilometers, or 3,200 miles across) and Dione (1,126 kilometers, or 700 miles across) at bottom; Prometheus (102 kilometers, or 63 miles across) hugs the rings at center; Telesto (24 kilometers, or 15 miles across) is a mere speck in the darkness above center.

The image was taken in visible light with the Cassini narrow-angle camera on Oct. 17, 2005 at a distance of approximately 3.4 million kilometers (2.1 million miles) from Dione and 2.5 million kilometers (1.6 miles) from Titan. The image scale is 16 kilometers (10 miles) per pixel on Dione and 21 kilometers (13 miles) per pixel on Titan.

The Cassini-Huygens mission is a cooperative project of NASA, the European Space Agency and the Italian Space Agency. The Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, manages the mission for NASA’s Science Mission Directorate, Washington, D.C. The Cassini orbiter and its two onboard cameras were designed, developed and assembled at JPL. The imaging operations center is based at the Space Science Institute in Boulder, Colo.

Click on the thumbnail to get a larger view — it’s quite spectacular.

Optical ripples

This interesting pattern showed up on my bedroom wall this morning — a spot of sunlight shining through the window. I’ve processed this photo to enhance the fairly subtle vertical “ripples” in the brightness of the light.

The spot of light in the photo is about 4 inches (10 cm) wide, but the light that made the spot passed through a 32 inch (80 cm) wide window. This happened because the early morning sun was low in the sky, right on the horizon, and it happened to be at just the right compass bearing to shine almost (but not quite!) edge-on to the window.

So what causes these ripples?

My first thought was that we had some vertical streaking of dirt on our windows (if you saw our windows, you’d think this was quite likely <smile>!). But as far as I could perceive, the dirt on the window was quite randomly placed. My next thought was that there were vertically-oriented thickness variations in the pane of glass — and this I was able to verify simply by looking at reflections in the glass, while viewing at an almost edge-on angle from one side. When I did the same thing from below, there were no visible variations. Bingo! Slight thickness variations in the pane of glass, with a vertical orientation, are causing this phenomenon.

I’ve never noticed these thickness variations before, most likely because they’re very small, and we don’t normally look through windows edge-on. I googled a bit to see if I could find a reference to these ripples, but I didn’t find anything directly relevant. In one description about how modern window glass is made (with “Pilkington’s method"), I did learn that one side of a pane of glass is “fire polished” as it moves down a conveyor — I speculate that the fire-polishing machine is responsible for the ripples, and that they’re linear because the glass is moving in only one direction past the fire-polishing machine…

Animusic

I’ve never seen anything like this — animated music, called “Animusic” by the author. It’s synthesized music, with choreographed animations of synthesized performers. But my words will never do this justice; visit the site and watch some of the sample clips.

And even though I can’t adequately describe it, I know I like it! I’m going to have to get me a set of the DVDs…

Bill Roggio

Bill Roggio (a long-time and invaluable blogger on the War on Terror, on “The Fourth Rail") recently traveled to Iraq and started filing reports directly from the field. His new reports are published on a new blog: ThreatsWatch.org. A sample:

From ThreatsWatch:

Today’s meeting was the first attended by the Sulemani, the tribe which sided with al-Qaeda and the insurgency over the summer. The meeting I attended last Monday with Lieutenant Oren and the tribal sheikhs was the first face to face contact with the Sulemani and the U.S. Military, and facilitated their attendance at today’s meeting.

Col Razak chaired the meeting, and was a commanding presence. He stressed the importance of Iraqis being in control and “not allowing any stranger to come here… Terrorists come to this town specifically to use you and the people, and only harm innocent people.” One of the greatest fears of the residents of the region is the premature withdrawal of U.S. and Iraqi forces.

But the locations of the Battle Positions in the Al Qaim region is also a matter of concern. The bases often lie on main roads, near mosques or marketplaces, and the residents are inconvenienced by their locations as travel is often restricted due to the checkpoints. LtCol Alford stressed the importance of the residents of the region and the tribal sheikhs taking responsibility for local security, so the bases can be dismantled in the future. “This will not happen overnight… you must build your government up, establish a police force” before the military units move out, said LtCol Alford. “I believe the first group to leave will be U.S. Forces, then the Iraqi Army. But this will not happen without your help.”

He goes on to describe the search for a weapons cache that the local troops got some information on, and the locals reactions. Good stuff, all of it — and another pair of reliable eyeballs, like Michael Yon, but with yet another valuable perspective. Make ThreatsWatch a regular reading stop…

Not a Bomb!

The MSM went a little crazy reporting about the alleged bomb blast that breached the levee (if you need a refresher on these stories, see here, here, here, and here for a representative sampling). The stories never did make much sense, but a recent report pretty much destroys the conspirists theories…

From the New Orleans Times-Picayune:

The floodwall on the 17th Street Canal levee was destined to fail long before it reached its maximum design load of 14 feet of water because the Army Corps of Engineers underestimated the weak soil layers 10 to 25 feet below the levee, the state’s forensic levee investigation team concluded in a report to be released this week.

That miscalculation was so obvious and fundamental, investigators said, they “could not fathom” how the design team of engineers from the corps, local firm Eustis Engineering and the national firm Modjeski and Masters could have missed what is being termed the costliest engineering mistake in American history.

Someone once famously said that when pondering the cause of anything, where one of the choices was human stupidity, bet on the human stupidity.

Right again!

The quote above is just the lead to the Times-Picayune article, which is a good one — read the whole thing…

Crab Nebula

Another amazing image from the Hubble telescope. When you look at one of these, and compare it to what was obtainable from earth-based telescopes over the past 50 years, it seems almost unbelievably sharp and detailed. Yet earth-based telescopes can already surpass Hubble’s resolution, have for many years been able to surpass its light-gathering power. With the advent of multiple-mirror telescopes with adaptive optics, and long baseline optical interferometry, earth-based telescopes are on the verge of greatly exceeding the capabilities of any telescope that could reasonably be placed in space — with the possible exception of a lunar-based telescope, though how practical and reasonable that might be is certainly open for debate.

From the official Hubble web site:

This is a mosaic image, one of the largest ever taken by NASA’s Hubble Space Telescope of the Crab Nebula, a six-light-year-wide expanding remnant of a star’s supernova explosion. Japanese and Chinese astronomers recorded this violent event nearly 1,000 years ago in 1054, as did, almost certainly, Native Americans.

The orange filaments are the tattered remains of the star and consist mostly of hydrogen. The rapidly spinning neutron star embedded in the center of the nebula is the dynamo powering the nebula’s eerie interior bluish glow. The blue light comes from electrons whirling at nearly the speed of light around magnetic field lines from the neutron star. The neutron star, like a lighthouse, ejects twin beams of radiation that appear to pulse 30 times a second due to the neutron star’s rotation. A neutron star is the crushed ultra-dense core of the exploded star.

The Crab Nebula derived its name from its appearance in a drawing made by Irish astronomer Lord Rosse in 1844, using a 36-inch telescope. When viewed by Hubble, as well as by large ground-based telescopes such as the European Southern Observatory’s Very Large Telescope, the Crab Nebula takes on a more detailed appearance that yields clues into the spectacular demise of a star, 6,500 light-years away.

The newly composed image was assembled from 24 individual Wide Field and Planetary Camera 2 exposures taken in October 1999, January 2000, and December 2000. The colors in the image indicate the different elements that were expelled during the explosion. Blue in the filaments in the outer part of the nebula represents neutral oxygen, green is singly-ionized sulfur, and red indicates doubly-ionized oxygen.

Click on the thumbnail above for a nice large version of the photo mosaic…