How much does life weigh? It sounds like a strange question, but to biologists it makes all the sense in the world. Yeast cells tip the scales at about 100 picograms each. A single E. coli bacterium ...

From plants and bacteria to animals and humans, our world is filled with many living things. In fact, there are approximately 8.7 million species of plants and animals in existence, and only 1.2 ...