You can use compiler builtins for SIMD these days (fairly standardized across Intel, GNU, etc. compilers). (And don't complain about portability if you are using hand-coded SIMD....you have to be using #ifdefs or something anyway.)
Aside from using specialized instructions that are usually accessible from C anyway via builtins, it's not like x86 assembly has much relationship anymore to what actually happens in the hardware; you can't even control the real registers anymore (most CPUs have many more physical registers than are exposed in the instruction set, and rename on the fly).
Besides, most useful optimizations are much higher-level than that (besides the obvious question of algorithm choices, performance is typically dominated by memory access and you are better off focusing on locality than instruction-level efficiency).
All metamaterials are not created equal. A metamaterial is an electromagnetic medium created by a composite of tiny (very subwavelength) constituent structures, put together in such away that longer wavelengths see an "average" material with properties very different from those of the constituents. Usually, the goal is to use resonant effects in the microscopic constituents to make a material that is effectively very different from naturally occuring EM media. But this can be done for many different purposes.
A negative-refractive metamaterial is designed to have an effective "negative" index of refraction, which makes Snell's law (refraction) bend backwards, and can potentially be used for flat-lens near-field imaging, subwavelength imaging (again only in the near field), etcetera. The main practical difficulty here is that the most interesting applications of negative-index materials are in the visible or infrared regime, but negative-index metamaterials rely on metallic constitutents and metals become very lossy at those wavelengths.
Recent "invisibility" cloak proposals are based on the observation that there is a one-to-one mapping between transforming space to "curve around" the object being cloaked and keeping space the same and transforming the materials. So, if you can make materials with certain properties, they could effectively cloak an object by causing all the light rays to curve around the object just as if space were curved. Although this is mathematically quite beautiful, there are many practical obstacles to making this a reality. The proposal is to make the required materials via metamaterials, but these are NOT negative-index metamaterials. The required materials theoretically tend to require some singularities (points where the index blows up or vanishes), and trying to approximate that in practice inevitably involves losses which spoil the cloaking. In general, the bigger the object to be cloaked compared to the wavelength, the smaller the losses have to be, and the narrower the bandwidth is going to be. When you work out the numbers, you see that this is why all the experimental demonstrations of cloaking have only "cloaked" (reduced the scattering crosssection, but not to zero) objects that were a wavelength or two in diameter. Cloaking macroscopic objects at visible wavelengths is a fantasy because the material requirements are insane. The only remotely practical prospects seem to be cloaking objects on the ground (which makes things technically easier because the coordinate transformations are nonsingular) to long-wavelength radiation, e.g. cloaking something against radio waves.
From one of the articles:
The spin ice state is argued to be well-described by networks of aligned dipoles resembling solenoidal tubesâ"classical, and observable, versions of a Dirac string. Where these tubes end, the resulting defect looks like a magnetic monopole.
They've managed to create the microscopic equivalent of a long skinny magnet or a long bendy solenoid: a set of dipoles aligned end-to-end, which acts just like a string with two "monopoles" at the ends.
While this is an interesting microscopic state of matter, from the "discovering monopoles" point of view it doesn't seem fundamentally different than the macroscopic description of magnet "poles" that has been well understood for over a century (and observed for a lot longer than that). I call hype.
Generating terahertz radiation, especially coherent Terahertz radiation, is hard because the frequency (around 300GHz - 20THz) is too low for conventional solid-state laser technology and too high for conventional electronic antennas. And it is potentially useful for a range of applications such as nondestructive high-resolution imaging (for e.g. materials, medical, and security applications), spectroscopy, or opening up new communications bandwidths. (Google "terahertz applications" and you'll find a lot of links.)
There are a number of terahertz sources that are becoming available, from optical rectification schemes to free-electron lasers, but they have a tendency to be bulky and inefficient, so a lot of researchers are looking for alternative generation schemes.
That being said, I suspect that the terahertz radiation produced by sticky tape is incoherent, which would severely limit its utility in practical applications. (Quite apart from the efficiency, which sounds like it is currently very low.) That doesn't mean that it isn't interesting from a basic science perspective, of course.
Full disclosure: I know Prof. Soljacic at MIT, who founded WiTricity, although I personally have no financial interest in the company; all of the above information is public and published, however.
It's called copyright law. Yes, it is a pain, but that's not Wikipedia's doing.
The problem is, getting permission just to "use" an image on Wikipedia is not enough. You need to get permission to use it under a license compatible with Wikipedia's goals: it has to permit the image not only to be used, but also to be redistributed, modified, even sold (although you can require redistribution under the same terms allowing free redistribution etc.). Furthermore, you need to get permission from the owner of the copyright - as other posters have noted, this is often the photographer, not the subject of the photo.
I'm sorry you had difficulty contributing to Wikipedia, but don't blame Wikipedia for diligently attempting to follow copyright law, or for your own ignorance thereof.
As pointed out in this review:
You can move whole directories but the Kindle flattens them out listing every file (by file name) separately on the main home page.
You can't organize PDFs into directories on the Kindle, which makes accessing a large number of PDFs a serious problem. It's like 1984.
(The lack of PDF annotation capability is also a headache.)
God made the integers; all else is the work of Man. -- Kronecker