Category Archives: Students

Items for students and others, interested in learning about science and engineering and the application of science in our lives. We post many of the general interest items here.

Illusion of Explanatory Depth

The “Illusion of Explanatory Depth”: How Much Do We Know About What We Know? (broken link was removed)

Often (more often than I’d like to admit), my son (Darth Vader over there on the left) will ask me a question about how something works, or why something happens the way it does, and I’ll begin to answer, initially confident in my knowledge, only to discover that I’m entirely clueless. I’m then embarrassed by my ignorance of my own ignorance.
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I wouldn’t be surprised, however, if it turns out that the illusion of explanatory depth leads many researchers down the wrong path, because they think they understand something that lies outside of their expertise when they don’t.

Great stuff. It took me a lot longer to stop asking why, why, why than most kids. I only gave up after years of repeated obvious clues that I was not suppose to ask why (once I aged past 5 or 8 or something – I actually have no idea when it is no longer desired). But most days I, curious cat, want to ask how does that work, why do we do that, why can’t we… I just stop myself. But it does mean I asked myself and realized I don’t really know. So I am at least more aware how little I really know, I think I am anyway.

The internet is a great thing. Google doesn’t mind if you ask as many questions as you want.

Nanotechnology Experiment Accidentally Discovers Forger Fix

Security that is small and imperfectly formed by Michael Pollitt:

“One day the chip fell off the paper backing that it was being tested on and the laser just hit the paper instead. Whereas we would have expected to have got no signal, we actually got a signal that had all of the right characteristics for a security device. That was enormously surprising,” says Cowburn.

Rather than reaching for the glue, Cowburn investigated further and found that ordinary paper gave robust security signatures. The random pattern of the paper fibres scattered back the laser beam to detectors, giving far better results than the microchip.

After tuning the laser system, he also discovered that the probability of two pieces of paper producing an identical reading was unimaginably remote.

Ancient Crash, Epic Wave

Ancient Crash, Epic Wave:

The explanation is obvious to some scientists. A large asteroid or comet, the kind that could kill a quarter of the world’s population, smashed into the Indian Ocean 4,800 years ago, producing a tsunami at least 600 feet high, about 13 times as big as the one that inundated Indonesia nearly two years ago. The wave carried the huge deposits of sediment to land.

Most astronomers doubt that any large comets or asteroids have crashed into the Earth in the last 10,000 years. But the self-described “band of misfits” that make up the two-year-old Holocene Impact Working Group say that astronomers simply have not known how or where to look for evidence of such impacts along the world’s shorelines and in the deep ocean.
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Of course, extraordinary claims require extraordinary proof, Dr. Masse said, “and we’re not there yet.”

Wireless Power

Wireless energy could power consumer, industrial electronics

Soljacic realized that the close-range induction taking place inside a transformer–or something similar to it–could potentially transfer energy over longer distances, say, from one end of a room to the other. Instead of irradiating the environment with electromagnetic waves, a power transmitter would fill the space around it with a “non-radiative” electromagnetic field. Energy would only be picked up by gadgets specially designed to “resonate” with the field. Most of the energy not picked up by a receiver would be reabsorbed by the emitter.

How flowering plants beat the competition

How flowering plants beat out the competition on ancient earth:

as the world headed into a cooler, drier climate around 250 million years ago, the early seed-bearing plants had a distinct advantage over their simpler, spore-releasing relatives that then flourished in moist, warm swamps.

Seed-bearing plants also figured out better ways to get around. Some seeds sprout improbably elaborate barbs in order to snag a lift on passing animals. A significant number hitch a ride by growing a morsel called a elaiosome that entices ants to carry them off a few feet. Other seeds are textured or buoyant, so they can float away on wind or water.

The human appetite for seeds has resulted in new forms of dispersal as well. Thousands of years ago, people began collecting and cultivating nutrient-rich seeds, like corn, lentils, and oats, for food.

Prochlorococcus

She sees vistas in a tiny speck of life

Even to the most dedicated biologists, Prochlorococcus may appear to be an unpromising subject. “They have no features,” acknowledges Chisholm. “They just look like little black specks.” But she believes that these microbes are, in fact, a window onto a larger vista. A milliliter of ocean water can contain 100,000 Prochlorococcus cells.

“They’re the minimum form of life,” she says. “We’ve decoded their genome sequence and found that it’s made of 1,700 genes. That’s the smallest number of genes that can convert sunlight into life.”

Nanotechnology Research

Brave nano world by Nate Birt:

At the federal level, the National Nanotechnology Initiative has requested more than $1 billion for nanotechnology research and development in 2007. The initiative is a network of 25 federal organizations, including the Environmental Protection Agency and the Department of Defense, that fund nanotechnology research at their own labs and at universities around the country, including MU.

Former President Bill Clinton started the initiative in 2000, and it became a part of the federal budget in fiscal 2001. Back then, the federal government spent an estimated $464 million on nanotechnology

Science and Engineering Graduate Data from NSF

NSF presents a large amount of data on the Characteristics of Recent S&E Graduates: 2003. The data covers undergraduates and graduates in 2001 and 2002. The report shows 937,700 bachelor’s graduates (*682,200 in science fields; 112,300 in engineering; and 143,300 in health care). And 246,700 master’s graduates (117,000 science; 47,000 engineering; 82,700 health).

Median 2003 salary for 2001 and 2002 bachelor’s graduates:

all science: $32,000
all engineering: $50,000

Some of the specific areas median salaries: computer and information sciences $60,000; electrical/computer engineering $70,000 and industrial engineering $70,000.

2003 median salaries for 2001 and 2002 masters graduates:

all science: $45,000
all engineering: $65,000

* the report totals do not exactly add do to rounding estimates by NSF.

Old Viruses Resurrected Through DNA

Old Viruses Resurrected Through DNA by Carl Zimmer:

About 100,000 segments of human DNA are remarkably similar to retroviruses, a class of viruses that includes HIV. Retroviruses insert a copy of their genes into the genome of their host cell. Scientists estimate that 8 percent of the human genome is made up of this viral DNA, known as human endogenous retroviruses, or HERVs.

World Robot Olympiad

This year 195 teams from 17 countries (mainly from Asia) will participate in the World Robot Olympiad next week. The World Robot Olympiad brings together young people to develop their creativity and problem solving skills through challenging and educational robot competitions.

Brunei’s bid to make history at World Robotics Olympiad