These early headphones used moving iron drivers, with either single-ended or balanced armatures. The common single-ended type used voice coils wound around the poles...

There are three main types of modern guitar: the classical guitar (Spanish guitar/nylon-string guitar); the steel-string acoustic guitar or electric guitar...

Seiko's efforts to combine the quartz and mechanical movements bore fruit after 20 years of research, leading to the introduction of the Seiko Spring Drive, first in a limited domestic market production in 1999 and to the world in September 2005. The Spring Drive keeps time within quartz standards without the use of a battery, using a traditional mechanical gear train powered by a spring, without the need for a balance wheel either...

The meaning of 'funk' continues to captivate the genre of black music, feeling, and knowledge. Recent scholarship in black studies has taken the term 'funk' in its many iterations...