Diamond crystal. Solid carbon comes in different forms known as allotropes depending on the type of chemical bond. The two most common allotropes of pure carbon are diamond and graphite. In graphite the bonds are sp orbital hybrids and the atoms form in planes with each bound to three nearest neighbors 120 degrees apart. In diamond they are sp and the atoms form tetrahedra with each bound to four nearest neighbors. Tetrahedra are rigid, the bonds are strong, and of all known substances diamond has the greatest number of atoms per unit volume, which is why it is both the hardest
What Time Is Love? "What Time Is Love?" was given international commercial releases on many occasions and in many forms between 1988 and 1992. The following lists detail most of these, but are not exhaustive. "What Time Is Love? (Pure Trance Original)" (catalogue number KLF 004T) was first released on 17 October 1988, and deleted following initially low UK media interest and sales. The reaction from continental Europe's clubbers and DJs led to further European releases in 1989 and 1990. In late 1989, a US edition of "Pure Trance 1" (sea-green writing on a black sleeve, and slightly different typography) was issued on the