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Comment Re:Offtopic: on the speed of electricity (Score 1) 137

How do you think electrons repel each other?

Electromagnetic fields, which do not "travel" in any reasonable sense.

The speed of light thing is actually more complicated if you involve relativity and quantum field theory and stuff, which is why I used the word "roughly" to protect myself exactly from people who pretend to know physics. If I had said "exactly at the speed of light", some theoretical physicist would have made some remark about this or that field theory or standard model solution or whatever kind of physics that I don't quite understand.

Comment Offtopic: on the speed of electricity (Score 1) 137

a short length of wire [...] sized to represent the distance electricity would travel in a nanosecond.

You cannot see such a piece of wire. Electrons drift at a speed in the order of 0.0002m/s, giving you a wire length in the order of 10^-13 meters.

Electromagnetic waves "travel" roughly at the speed of light. But when someone talks about the travel of electricity, the thing that people think about is the flow of electrons, not the electromagnetic waves.

Comment Protests are a display of effort (Score 3, Insightful) 76

One thing that definitely plays a role in this discussion is that in big street protests, a lot of people have to come out of their house and basically waste their day for this one cause. This in itself shows how strongly they feel about certain issues.

This is much more difficult in the case of internet protests: we all know how little facebook likes mean.

If you want to make web-based protests work, you will somehow have to incorporate an element of effort, which - since the only tissue we have online is that of information - is going to have to have some intellectual ingredient. Indeed, the many discussions we are having on this very website can be seen as minor protests.

Comment Re:What does it mean to divest? (Score 1) 214

Harvard has a sick amount of money, and they *can* afford to miss some of it. If they "lose" money by not investing in oil, they will still be able to fund many students' tuition fees (because Harvard is not /just/ a school for the rich, although arguably you need to be in higher income classes to be admitted in the first place).

If Harvard "loses" money or otherwise does not have the budget they projected, nothing changes.

Comment Use click to play (Score 1) 184

Java zero days are easily avoided by using "click to play", which does exactly what it sounds like: disable flash and java applets until you click them. In Chromium, this is easily enabled in Settings -> Show advanced settings -> under "Privacy", Content Settings -> choose "Click to play" under Plug-ins.

Java (and Flash likewise) has never been safe, and it's a shame that click to play is not the default. Additionally, animated ads are often Flash or Java-based, so this also kills distracting movies.

Comment Re:Nice, put unobtainable (Score 2) 26

There is the new cruiser class, where contestants are judged not on their speed but their practicality by a jury.

Setting clear price requirements is very difficult since man-hours can make up for costs of individual parts, and most of the teams consist of groups of students (10-30 each) working full-time for a year or more on just that one car. Either way, $10,000 is way below what you need for a serious solar car (you can easily spend that kind of money on the solar panels alone).

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