Bacteria can be found almost everywhere on Earth, from the bottom of the ocean to the inside of our intestines. However, the single-celled organisms typically measure a few micrometers and can only be seen through a microscope. Now, researchers have identified a thin, thread-like bacteria species that grows up to 0.4 inches (1 centimeter) long. Named Thiomargarita magnifica, it is the largest bacteria found to date.