Gram staining. Gram staining or Gram stain, also called Gram's method, is a method of staining used to differentiate bacterial species into two large groups (gram-positive and gram-negative). The name comes from the Danish bacteriologist Hans Christian Gram, who developed the technique.
Horizon Oil Sands. Horizon Oil Sands The Horizon Oil Sands project (or Horizon) is an oil sands mining and upgrading project. Horizon is 100% owned and operated by Canadian Natural Resources Limited.
Fire crews battle a blaze on the Deepwater Horizon oil rig owned by the British oil company BP on April 21, 2010, in the Gulf of Mexico near New Orleans. The Deepwater Horizon oil platform burns on April 22, 2010, before sinking into the Gulf of Mexico.