According to relevant definitions, microorganisms should be small and can only be seen under a microscope. However, a bacterium recently discovered by scientists in mangroves in the Caribbean has overturned people’s previous understanding of microorganisms. The linear single cell of the microorganism can be seen by the naked eye, which can reach 2 cm, which is equivalent to a peanut, 5000 times larger than other microorganisms. More importantly, this giant bacterium has a huge genome. Unlike ...