Progeria, also known as Hutchinson-Gilford progeria syndrome (HGPS), is a rare genetic condition that causes a child's body to age fast.Most kids with progeria do not live past the age of 13. The disease affects both sexes and all races equally.rogeria, also known as Hutchinson-Gilford progeria syndrome (HGPS), is a rare genetic condition that causes a child's body to age fast.
Pentatonix is made up of Avi Kaplan, a most distinctive bass; Kevin Olusola, the vocal percussionist or the beatboxer; Kirstie Maldonado, the mezzo soprano and only girl in the line-up; Mitch Grassi who does both tenor and counter-tenor voices; and Scott Hoying, the baritone who sings lead most of the time.
How Woodwind Instruments Work. Woodwinds are one of the major families of instruments in use today. Woodwinds are basically defined as hollow tubes, which, when blown on one end, produce a sound. Most wind instruments have keys or fingerholes to vary the pitch of the sound, and different methods may be used to create the basic sound. Mouthpieces Single Reed (Clarinet/Saxophone) The single reed produces a sound by vibrating against the mouthpeice when blown. The reed is held down by a metal ligature. Reeds are very sensitive, and must be cared for to produce the right tone. Double Reed (Oboe/Bassoon) The double reed uses two reeds, tied together, to make a sound. The sound it produces is somewhat nasal, and can be very difficult to build, maintain, and play. Most double reed players make their own reeds. The tight opening of the double reed means that the musician can play long phrases in one breath.