Nothing dies of old age in the ocean. Everything gets eaten and all that remains of anything is waste. But that waste is pure gold to oceanographer David Siegel, director of the Earth Research Institute at UC Santa Barbara.
The mass extinction that saw the end of the dinosaurs was made worse than it might have been by the structure of the ecosystems of the time.
Following the Gulf oil spill, many people were surprised by how quickly the oil seemed to disappear. Now scientists say they know where it went - into the food chain.