Currently,the best explanation for the loss of methane is that it chemically reacts with dust in the atmosphere.

VOA: special.2009.12.30

This metal form is chemically treated before being covered with ink and then pressed onto paper.

VOA: special.2009.09.02

Its creators said it is the longest chemically designed DNA structure ever produced in a laboratory.

VOA: special.2010.07.20

Chemically,elements like potassium and aluminum are added and taken away.

VOA: special.2009.09.14