About 30 percent of human conceptions do not progress to full term ( 22 percent before becoming clinical pregnancies ) and this creates a second arena for conflict between the mother and the fetus, because the fetus will have a lower quality cut off point for spontaneous abortion than the mother.
22.
In terms of mobile phones, the teen buzz and similar rings tones ( The Mosquito # Teen Buzz ringtone ) have shown that many perhaps even most mobile phones are at a minimum capable of producing frequencies high enough that many adults can't hear them . ( You can get different tones and test them and some fairly high frequencies seem to work but of course it's difficult to know what frequency the phone is actually producing without some sort of accurate recording / monitoring . ) And these even seem to work with MP3 and I think AAC compressed versions tend to work although these aren't generally designed to keep such high frequencies well AFAIK . Bear in mind of course we aren't talking about accurate musical reproduction just some sort of noise sufficient for a listener to hear . ( I tried it myself once on my cheap Panasonic VS2 and it did work, I did try a variety of frequencies up to about 21khz but I can't remember the cut off point where someone I tested it on was able to hear something, the lowest age was about ~ 21 so probably not the ideal test . ) talk ) 01 : 22, 14 June 2010 ( UTC)
