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The feel of a pen as it clicks open and closed, pointed for note taking (or probably more likely the feel of an electronic stylus). The sound of pages rustling in a notebook during the first class...

Viruses must hijack their hosts’ cellular machinery to make more viruses, so preventing this hijacking could lead to a host of new treatments for viral diseases. However, much is unknown about how...

Every living thing on Earth, from bacteria to humans, uses the same set of 20 amino acids to build all of its proteins, called our “amino acid alphabet.” But why that particular set of 20? If...