Category Archives: Technology and Society

Business, Economics, Media Criticism, Political Commentary, Technology and Society

College Is For Suckers

16 Comments

In many cases, it is. I’m glad I made it through without any student loans, though I was paid fairly well upon graduation as an engineer in the early eighties. But it’s really crazy to spend as much money as a degree costs when the degree has no marketable value.

I think that overrated higher education is the next government-financed bubble to pop.

[Update mid afternoon]

Derb has some more reader emails:

I made the same mistake myself: a BS in Geography is worth nothing on the job market. If I had it to do over again, I’d have taken shop classes in high school (assuming that they existed) and gotten a 2-year blue-collar technical degree. Other than engineering and business degrees, most college BSs and BAs are worthless.

and this:

Higher education is the biggest scam going. I don’t think that’s news to you (or Charles Murray). What’s really disheartening is that the business world plays along — demanding four-year degrees for positions that shouldn’t require them. It’s just a lazy way for them to make their “first cut.”

That is the problem. As Derb says, an aptitude test would do a better job, but it might not provide enough “diversity,” so the degree has become a poor surrogate. And it reminds me of NASA’s astronaut selection policy. It likes to select PhDs, or at least grad degrees, not because they are necessary for the job, but because they have so many more applicants than positions, it makes a handy filter.

But if I were a businessman, and I was just looking for a degree as evidence that the holder at least had the stick-to-it-iveness to get a degree, I’d be just as happy, and perhaps happier, with a technical associates degree than a bachelor’s in French Lit. Or even English.

Technology and Society

Rebuilding Joints

2 Comments

I suspect that this, not crude surgery, is the wave of the future:

The scaffold has two layers, one that mimics bone and one that mimics cartilage. When implanted into a joint, the scaffold can stimulate mesenchymal stem cells in the bone marrow to produce new bone and cartilage. The technology is currently limited to small defects, using scaffolds roughly 8 mm in diameter.

Bring it on. It’s only going to get better.

Science And Society, Technology and Society, War Commentary

Biohackers

2 Comments

This may not end well:

A man saying he was doing research for the U.S. government called with a few polite, pointed questions: How did she build that lab? Did she know other people creating new life forms at home?

The caller said the agency he represented is “used to thinking about rogue states and threats from that,” recalls Ms. Aull, a recent Massachusetts Institute of Technology graduate.

I’ll bet they are.

Media Criticism, Space, Technology and Society

The Myth That Won’t Die

6 Comments

Once again, scramjet proponents are touting them for space access:

Officials hope the engine eventually will provide a speedier transition between conventional aircraft in the atmosphere and rockets in outer space for deployment of satellites, and reconnaissance or strike missions.

“The long-range goal of this for the Air Force is access to space,” said Charlie Brink, an Air Force Research Laboratory propulsion directorate official who manages the X-51 program from Wright-Patterson Air Force Base.

I wonder if he’s actually done any systems studies to see whether that’s going to pan out? I have.

I’m all in favor of scramjets — they have lots of interesting and useful military applications, but it is very unlikely that they will be helpful for space access. I won’t repeat what I wrote the last time this issue came up (geez was it really five years ago?), but you can go read it here:

Proponents claim that by allowing airbreathing up to high Mach numbers, there is no need to take along as much oxygen for the rocket engines, because they can gather it for “free.” This argument assumes that space transportation is expensive because propellants are, but those aren’t the cost driver. If they were, space would already be affordable, because liquid oxygen is actually about as cheap as milk. Propellant costs are such a tiny fraction of launch costs that they’re down in the noise. If we ever get to the point where they become a real issue (as they are for airlines), we’ll have solved the problem.

Their argument also fails on the grounds that collecting oxygen isn’t really “free.” As the old joke goes, there’s no free launch.

If your space transport were to be single stage, you’d now need three propulsion systems — conventional jet, scramjet, and rocket for when you left the atmosphere (which you must do by definition to go into space). It may be possible to have a scramjet lower stage and a rocket upper stage, but the bottom line is that time spent in the atmosphere (necessary to utilize the scramjet) is time spent fighting drag, defeating the purpose. Rockets want to spend as little time as possible in the atmosphere, and carrying two other kinds of engines along and spending enough time in the air to utilize them, just to save on a propellant as cheap as oxygen, just doesn’t make design sense.

In addition, a scramjet engine is designed to operate at a specific vehicle speed, and has poor performance in “off design” conditions, rendering it a poor propulsion choice for an accelerating vehicle.

Henry Spencer debunked airbreathers to orbit earlier this year as well.

Administrative, Technology and Society

SSHFS Problems

16 Comments

I’ve been using sshfs to do remote editing on my web server. I create a directory with the server name as a mount point, owned by me in my home directory. I then mount with

$ sshfs -p <portnumber> <servername>: <mountpoint>

I also have the keys set up so it does so without a password prompt. It seems to work, but I only have read-only access — when I try to write a file it tells me that I don’t have permission. Also, I notice that when the file system is mounted, I get an owner and group of “1009” for the mount point. Is this normal? Does anyone have any idea what’s going on?

[Tuesday morning update]

D’oh! I just noticed that my line command wasn’t displaying properly before. It’s fixed now.