Category Archives: Technology and Society

Heating The Planet

…with biodiesel.

Maybe politicos should do more research before imposing half-baked energy mandates?

It wouldn’t do any good. They’re mostly too stupid to understand the results of the research, or too much on the take from the benefitting industry to care. But they get to pretend to be saving the planet.

Speaking of biodiesel, will the same be true of biokerosene? Is the “green aviation” initiative another unintended consequence on the way?

Greased Lightning

I’ve been suffering with a crummy DSL connection for months, since the move back to CA (I’ve had to reboot the modem often, because it seems to slow down and start dropping packets periodically, with multi-second delays on pings). But yesterday, Verizon fiber finally came to the house.

This is real broadband, for the first time at home. It’s like night and day, in terms of page loads and video.

[Update a few minutes later]

No, I don’t know why the date is wrong. I did the test today. Maybe I should try a different site.

[A couple minutes later]

Bandwidthplace says that it’s about 4 Mbps up and 15 down.

Too Trusting

Spammers are starting to move into the social network sites:

Most social networks have internal messaging systems for communication between members. Petre’s group examined that of Facebook, which boasts 5 percent of the world’s population as its users. While Facebook has an antispam engine, the group found that it was better at filtering out phishing e-mails than preventing spam messages from getting through.

The group started by creating fake profiles to trick users into friending them. They created three profiles, one containing almost no information about the user, one with some information, and one with detailed information. They used those profiles to join popular groups and began sending out friend requests.

Within 24 hours, 85 users had accepted a request from the first profile, 108 from the second, and 111 from the third. Petre says that acceptances began to accelerate, since more than 50 percent of the time, users would accept the request if they shared a “mutual friend” with the fake profile. In some cases, he says, users would send a message asking for more information about how they knew this supposed new friend. The researchers didn’t respond to these requests, but in many cases, Petre says, users accepted the request anyway.

The researchers then posted a link without any explanation to the fake profiles’ walls, using a URL shortener to obscure where the link went. Almost 25 percent of the profiles’ “friends” visited the link, Petre says.

I am pretty picky about who I friend on Facebook. I will generally only accept people that I’ve met in meatspace, or at least had previous interactions with on line. Simply having mutual friends is not sufficient. I might friend someone who I don’t know if they provide a message explaining why they want to be my friend, but never if it’s simply a generic friend request. This just seems like basic common sense to me.

Not Quite That Simple

The Navy has developed a submarine escape trainer. Presumably, it assumes that your sub isn’t too deep.

But while I assume that it’s part of the training, I see no mention of the need to allow the air to flow out of your lungs as you ascend. The pressure in them at depth is going to be several times that at sea level, and if you hold it in, you’re guaranteed a pulmonary embolism, likely fatal. Also, surface rescuers would have to have a hyperbaric chamber handy, otherwise those rescued are almost certainly gong to get badly bent (again, possible fatal, certainly injurious), unless the accident from which they are escaping occurred shortly after submerging. But if you’re going to float around for awhile before being rescue, bends seem almost certain. On the other hand, I guess it still beats drowning or asphyxiation at depth. Sounds sort of like an ejection seat for an aircraft — attempted suicide to avoid certain death.

[Update a couple minutes later]

I don’t know what current training requirements are, but I think it would be worthwhile to give scuba training to all submariners, to reduce the chances that they’ll hold their breath while ascending. Rule number one of diving training is to never hold your breath underwater. Of course, it’s an easier rule to obey when you have an air supply…

[Update a few minutes later]

Yes, as corrected in comments, bends isn’t (aren’t?) an issue. I’d forgotten that subs are maintained at one atmosphere.