Covering life, earth, and health science scholarly literature, the site contains 52+ million articles, 30 million abstracts, and over 2 million PDF full texts. It was launched in November 1998, covering biology, applied life sciences, agriculture, horticulture and forestry, earth, environmental, and medical sciences. It features many disciplines of biology. Horticultural topics cover the cultivation and production of primary and secondary fruit and vegetable species, whereas other subjects include information on numerous aspects of agriculture and forestry. Other science disciplines covered on this site are the environmental sciences, including biodiversity and global warming, as well as health sciences.