Please tell us how it is a better idea to trust an unsigned site at the other end of an unencrypted connection MORE than a self-signed site at the end of a SSL connection. If sites with self-signed certs trigger a warning on browsers, then every site served in the clear should as well. A good compromise would be not to display the lock icon for sites with self-signed certs.

This is the first time I've really wished I had mod points! Nice post.

I wrote a simple prototype for this back in the '90s, and submitted a marginally upgraded version as coursework circa 2002. On hindsight it's not a terribly useful system, it defends against shoulder surfing and not much else. My feeling back then was that a scheme such as this would be useful for ATMs, but given the sophisticated camera + card scanner attacks being employed today, I doubt it'd be much use.

Meta-irony for the win.

I'm currently teaching myself linear algebra with the aid of Khan's videos, and I couldn't be happier with the quality of the material.

The fact that his work is steadily garnering more attention is a good thing in my view, since it increases the likelihood of more excellent videos being made available for free as a result of donations, grants, etc.

Seems very much like the radio chess sets that saw some popularity in the late '80s.

No. Think about it - in space, to "slow something down" means the same thing as "speeding something up," that is, changing an object's velocity (commonly known as acceleration.)

As such, you'd have to spend energy to accelerate toward your target, and when you were about to reach it, decelerate (i.e. accelerate in the opposite direction) in order not to go past it.

Another way to think about it is that in your inertial frame, you are always resting. So there is no kinetic energy to "absorb" to slow down since you aren't actually moving, from your point of view. Of course, that small planetoid in front appears to be moving towards you at a large rate, but good luck "absorbing" the kinetic energy from that impact :)

Bah, 65TB? Wait till they discover what's in /dev/rand! I wish the cryptanalysts good luck!

Like how inflammable is more than... flammable?

That's what the cyborg raptors are for!

I'd surprised to find that they are undetectable by electric or magnetic means. I mean, can you really hide the magnetic or electric signature of a big sub?

Someone has already thought of this - http://en.wikipedia.org/wiki/Magnetic_anomaly_detector

Which part of "[The mutation's] effects don't occur until after the childbearing years." did you fail to grasp?

Really, just making a textbox that didn't accept spaces or other invalid input (displaying a text message below the box when the user attempts to type an invalid character) would solve all the issues.

I believe this technique is already commonly used in several Windows applications and the OS itself. I can't remember if I've seen the same for OSX.