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What does a human cell look like? That is somewhat of a mystery because most current cellular models are static and based on limited data, according to scientists from the Allen Institute for Cell Science in Seattle. Until recently researchers lacked the tools to assess cells and their tiny internal structures, known as organelles, in real time on a large scale, they say. (Hernandez, 4/6)

Viruses are supposed to be tiny and simple — so tiny and simple that it's debatable whether they're even alive. They're minimalist packets of genetic information, relying entirely on the cells the infect in order to survive and reproduce. But in 2003, researchers identified a new kind of virus that that turned scientific understanding of viruses upside down, and tested the boundary of what can be considered life. (Bichell, 4/6)