A modern dac is supposed to digitally filter at 20 kHz (very hard cutoff), in exchange for lots of noise above 100 kHz. A soft roll-off analog filter takes care of the content above 100 kHz.
I suspect that ultrasound in this context really means 16 kHz or so, at volumes that are too low for the ear, but easily picked up by a microohone and some signal processing.
What kind of audio source did you use to find that you can hear 22 kHz? Unless you have an ultra low noise analog sine wave generator and amplifier, you are likely to hear noise, artifacts of the DA converter, and effects of clipping when you crank up the volume. The stated limit of 20 kHz for the human ear is the frequency where the pain threshold and the hearing threshold coincide for an average young person, so it is likely that you need >110 dB SPL to have any chance of hearing above 20 kHz. A device with 90 dB S/N ratio will likely blast you with lower frequencies, which you could easily mistake for "I can hear 20+ kHz".
I did once fry the tweeters of my (60 watt rated) loudspeakers while trying to test the limits of my hearing as I was sending all amplifier output power to the tweeters.
Although the general point is probably correct that min/max charge levels affect Li-ion lifespan, I would be careful with using batteryuniversity as a source of information. It's really a weblog of a small manufacturer of battery chargers that presents a couple of small-scale test results as if they represent the absolute truth for all brands and types of Li-ion batteties.
Until a music-streaming provider complains about being discriminated against, I don't think the review of the whitelist is the problem. The legal issue seems to be about the question whether discrimination by type of content (music, in this case), regardless of the company that provides the content, is allowed or not.
My feeling is that T-mobile is in a weak position here. Because if T-mobile is right, they would also be allowed to discriminate against other types of content; for example by making VoIP traffic more expensive. In fact, this is already happening: the cost of any data traffic is increased to subsidize the bandwidth for music data.
I'm trying to say that the construction that allows easy battery replacement comes with several points of failure that ai'd rather do without.
What is a typical cost of a car, per distance, in the US? In the Netherlands, about 0.19 EUR/km is the bare minimum in marginal costs for a small car with good fuel economy.
Asthma is as American as Apple Pie.
No, actually pretty similar on average; the solar may even edge it. The nuclear reactor obviously has higher power at night, but much lower power during the day than the solar. The average capacity factor of solar is about 10-20% depending on location, so 9GW of solar will produce somewhere between 0.9GW and 1.8GW on average, whereas this is a 1.2GW reactor; and the solar was installed much, much more quickly, and probably cost roughly the same or even less than the nuclear.
"I've yet to hear a reason why removable batteries are a bad thing for consumers with the sole exception of anorexia."
I used to have an HTC Desire S, with removable battery. A drop from 5 cm with the wrong angle would temporarily disconnect the battery, leading to a power-off. I had to put in a spacer to push the battery harder against the spring contact. (it took quite a while to figure out what the problem was)
I have a low-end LG L40 with removable battery. Every time I drop the phone, the back cover will come off and I end up with a separate battery, cover, and front. At least it immediately removed its own battery when I dropped it in the toilet. (phone is still working after a rinse in distilled water and thorough drying)
And I have a Nexus 5 with "non-removable" battery. The back cover can still come off with some effort; the battery can be replaced although it's a bit more work. And I don't have the above problems with self-disassembly and flaky contacts.
I'll take the "nonremovable" battery, thank you.
You are not alone, my four-digit friend.
The summary leaves out several very important limits on this new law:
1. It does not apply to business that don't sell directly in interstate commerce. (This is narrower than the usual "affecting commerce" language Congress likes to use.) So your local lawn-care service for example may be exempt.
2. It only applies to businesses that use "form" contracts.
3. It only applies to those "form" contracts if the customer does not have a meaningful opportunity to negotiate.
Yeah, nobody dies from radiation.
But there's been an estimated 1600 deaths from the practical problems due to the evacuation, things like the hospital having to be shutdown.
"Truth never comes into the world but like a bastard, to the ignominy of him that brought her birth." -- Milton