Scientists discover how mother-of-pearl self-assembles into a perfect structure. "The behavior of structural defects in a growing nacre was surprising. Defects of opposite screw direction were attracted to each other from vast distances. The right-handed and left-handed defects moved through the structure, until they met, and canceled each other out. These events led to a tissue-wide synchronization. Over time, it allowed the structure to develop into a perfectly regular and defect-free." [Phys.org]
The evolutionary origins of friendship. "What begins as a mere platitude, though, can snowball into a deep engagement. If I demonstrate that I value you, then, all else equal, it pays for you to value me in return. Your increased valuation of me can then lead me to care more about you, and so forth. To the extent we can make ourselves valuable to each other, we will have a vested interest in keeping each other around, which comes in handy during times of misfortune." [Scientific American]
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