Largest organisms photosynthetic unicellular and multicellular protists that are related to land plants. The thallus of the unicellular mermaid's wineglass, "Acetabularia", can grow to several inches (perhaps 0.1 to 0.2 m) in length. The fronds of the similarly unicellular, and invasive "Caulerpa taxifolia" can grow up to a foot (0.3 m) long. A member of the order Cetacea, the blue whale ("Balaenoptera musculus"), is thought to be the largest animal ever to have lived. The maximum recorded weight was 190 metric tonnes for a specimen measuring , whereas longer ones, up to , have been recorded but not weighed. The African bush
Downward to the Earth Downward to the Earth Downward to the Earth is a 1970 science fiction novel by American writer Robert Silverberg. It is a tale of the quest for transcendence (a frequent Silverberg theme) set on another planet, and includes references to "Heart of Darkness", Joseph Conrad's classic tale of colonialism, including the name of Kurtz. Its title references Ecclesiastes 3:21 in the Bible (""Who knows if the spirit of people rises upward and the spirit of animals goes downward to the earth?""). "Downward to the Earth" was originally published as a four-part serial publication, starting in the November 1969 edition of