Arguably, no, light does not slow down in a medium. It does however take a longer path through said medium, making it appear to be slower. At least, this is the quantum interpretation (as far as I'm aware, not yet nearly as comfortable with quantum as I'd like). Thus, the speed of light is constant in a medium too, it's just got a longer path to take.RaffB said:One minor one for me.
In E equals M C Squared, I always get irked when people say C is the speed of light....
C is the speed of light in a Vacuum, as light can and does slow down depending on the medium it is travelling through..
Well, I'm not going to argue that Pi has an end. Maybe it does, but I'm inclined to think not.alfinchkid said:The least controversial one I can think of is the thought that Pi has an end.If we find the end of Pi, we have an exact ratio of the diameter to circumference of a circle, and the roundness of an arch is now nonexistant, having been reduced to a series of infinitesimally small jagged lines like pixel art. It's like finding the end of infinity, when you get there, you can always add 1 to it, meaning it will still go on; in this case, you can always make the little jaggies smaller, making the circle even more round. Pretty much the only result of proving Pi has an end is proving that we do, in fact live in a matrix (as we now know the resolution of life).
However, life may in fact have a resolution. The Planck length [http://en.wikipedia.org/wiki/Planck_length] is pretty significant.
Other than that, some misconceptions I've seen in this thread;
Firstly, as far as climate change goes. It is a thing, it is happening, I think we can all agree on this. The arguments about this largely refer to scale. The scientific community at large (particularly y'know, the climate scientists) thinks it is being driven to new extremes by human activity. The minority that disagree with this largely work in unrelated fields.
Regardless, let's not argue about that, because we'll likely get nowhere.
Instead, I'll explain one of the reasons why so many scientists are so worried about this. In one word, bifurcation.
It is possible that we are approaching a point where the behaviour of the climate system is very sensitively dependent on changes in things like CO2 levels. What this means is that a tiny change in CO2 levels could result in a huge change in the behaviour of the climate system, in fact entirely new behaviour could emerge.
These kinds of bifurcations are seen all the time in physical systems (and for that matter, in mathematical systems).
Part of the issue with this is that while it may only take a minor CO2 change to cause a huge change in climate, it may require orders of magnitude more effort to get back to the initial state of the system, if it's possible at all.
Hopefully that conveys why so many scientists are sort of freaking out about this issue.
Other than that, it's mostly just misconceptions about nuclear power;
Nuclear fission as a global source of power is not sustainable. Uranium and thorium are finite resources. Unlike even fossil fuels, these do not get replenished (at least, not without a supernova, which we really don't want). It is possible (perhaps even likely) that mining asteroids will extend this supply sufficiently for it to get us by for a long time. If this is the case, then awesome, but we're probably still a decade or two away from anybody getting out there (come on, Planetary Resources!)
Besides that, modern nuclear power is actually pretty safe. Have you noticed how we really haven't heard much about the Fukushima plant in a while? The worst nuclear power incident since Chernobyl, and news about it quietened down pretty quickly. Now, I'm not saying that it is perfectly safe, nor that there haven't been ill effects from Fukushima; the current estimates put cancer related deaths due to the disaster at between 15 to 1300... but with the most likely amount being 130. Now, that's sad, it's horrible that people are going to die because of this. However, 130 deaths? That's pretty insignificant when compared to the deaths caused by coal and oil power (in fact, found this nifty little diagram [http://www.the9billion.com/2011/03/24/death-rate-from-nuclear-power-vs-coal/]).
Anyway, that's all I have to say about that.
EDIT: Oh also, Coal ash is more radioactive than nuclear waste [http://www.scientificamerican.com/article.cfm?id=coal-ash-is-more-radioactive-than-nuclear-waste].