My Samsung Chromebook from 2012 has an ARM processor, solid state storage, and no fans. It is pretty slow by today's standards though.
I think several companies make cases for the Intel NUC boards that radiate the heat away and have no fans, too.
My Samsung Chromebook 3 gets a touch warm but never uncomfortably so like my 2012 Retina MacBook, which lets you really feel it when your code is inefficient. (Granted, the Chromebook is a lot less powerful)
525 lines / 2 for interlacing * 60 fields per second = 15750
They were still using CRT TVs in 2012 when I finished high school. I wouldn't be surprised if there were still plenty of schools with CRT TVs and VCRs for educational material.
I find coil whine a worse background sound than the lower frequency fan hum.
I was worried about performance, but it has been very acceptable. It depends what you need it for, but I can run 2 monitors, a Linux VM and atom all while streaming HD video. Or I can do light web browsing for 10 hours on battery. I love it.
On the rare occasions I need more power, I spin up a spot instance.
 If you use Linux on a laptop, install "tlp". It optimizes battery life without a noticeable reduction of performance.
Obviously newer models are different from older models, and Air models probably don't have the fans that Pro models do, but the claim that Macbooks don't have fans is a bit too broad to be true.
This is why these 'simple' naming schemes are confusing.
In Jobs' 2x2 matrix, the portable half was initially populated by iBook and PowerBook, later by MacBook and MacBook Pro.
It's unfortunate that Apple has confusing brand names, but the fact remains that the Macbook indeed has no fans so the original comment who hears fan noise is obviously using a different model of laptop.
So if you say that recent Macbooks have no fans, that may well be true. But it's not true for all Macbooks.