Mosquito ringtones emit high-frequency tones that are inaudible by adults but can be heard by teenagers. It is very normal for people to lose their hearing as they age. The loss of hearing is gradual in most people, while other may experience more severe hearing loss.
The high-frequency tones (or mosquito ringtones) are those above 17kHz. Most people over the age of 30 will not be able to hear them. Below are file downloads in MP3, WAV for windows based phones, OGG (Ogg Vorbis audio format), and M4R (iPhone …

Music and sound can have a powerful effect on the mind. A slow, light song can relax you, a happy, upbeat song can give you energy, and a good driving song can make your journey seem half as long. A song from a tape that you completely wore out in high school can bring you back instantly.
A researcher in Tokyo, Japan who studies the mind and artificial intelligence has taken this one step further. He is trying to show not only that music and sound can affect your …