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
For the World Is Hollow and I Have Touched the Sky For the World Is Hollow and I Have Touched the Sky "For the World is Hollow and I Have Touched the Sky" is the eighth episode of the of the American science fiction television series "". It was aired by NBC on November 8, 1968 and was written by Rik Vollaerts, and directed by Tony Leader. In the episode, the crew of the "Enterprise" rush to stop an asteroid from colliding with a Federation world, but discover the asteroid is actually an inhabited generation ship. The Federation starship "Enterprise" is targeted by nuclear missiles. The primitive weapons are destroyed, and