From what i think i understand about the way the eye works, we have cells which can identify either red, blue or green light, which i guess corresponds to a certain wavelength (475nm, 510nm, 650nm), yet yellow light, for example, has a wavelength of 570nm. Is this picked up only partially by red and green receptors? If this is the case, technology using 3 colours of pixels in screens must be perfectly adapted to human eyes, yet a new type of television has been released with a yellow pixel as well. Would that offer any advantage to colour perception, or is it just smoke and mirrors?

I have a wireless telecoms related technical supposition that I need to test.  Big picture question. 

There is a common refrain that with all the new bandwidth hungry devices, and the mobile market expanding rapidly, that there is “a shortage of spectrum”.  This is kind of obvious, and is repeated often enough that it “must be true”.  But is it?

Is it not possible that spectrum is infinitely divisible, and technically bandwidth could be more finely utilized than is currently the case?  Something akin to compression technology or multiplexing which has made otherwise scarce wireline and fibre bandwidth more effectively used?

Is there some forward looking science going on around these possibilities?  Kind of leads into a discussion about once all telecoms carriers migrate to LTE, what’s next?

Sitting recently in my school's gym, I noticed that the aging flourescant lights tinged the whole hall a slight orange colour. Looking towards the windows, I noticed that the light pouring in appeared to be blue, without the sky being visible. It struck me that perhaps - as you place a blue filter in front of a light - the sky, during the day, tinges everything we see a slight blue. Is this possible?