Number of words: 341 Multicellular strings of bacteria were born around 3.5 billion years ago. Filamentous bacteria—so named because they form chains—kill themselves to yield precious nitrogen for the good of their sisters. Every tenth or so cell commits suicide for the benefit of this communal thread of bacterial life. Another, quite different kind of … Read more
Number of words: 555 The extraordinary possibilities of evolution are the result of errors in replication. Mutations are critical. If the replication of RNA were error free, and perfect, no mutants would arise and evolution would stop. Nothing would change. There would be no living diversity. So mutations are required for life to emerge. Equally, … Read more
Number of words: 337 In the traditional picture of the origins of life, the instant the first replicator pops up is a rare and fleeting moment that bootstraps the rest of evolution. This is an enormously lucky event, a fleeting spark that lights the fuse of all life. As in Greek cosmology, from a “vast … Read more
Number of words: 164 Look under the hood, into the cells of the life that thrives around us, and you will find master molecular replicators, the messengers of our inheritance. Today, the most common is deoxyribonucleic acid, DNA. Apart from a few viruses, all life on Earth now relies on DNA to hold the information … Read more
Number of words: 340 Centuries ago, the Scottish botanist Robert Brown became fascinated by the zigzag motion of fragments within pollen grains. In his pioneering observations, made with a primitive microscope, Brown had spotted this random jittery motion as early as 1827. What puzzled him was that this incessant movement did not arise from currents … Read more
Number of words: 441 Legend has it that, one day in a pub in Bloomsbury in 1955, a lively conversation with Haldane over a few pints turned to the serious subject of the lengths that one would go to save another’s life. Would, for example, Haldane risk his life to save a drowning man? Haldane, … Read more
Number of words: 284 Natural selection can act on human culture as well as on genes. Some scholars have scoffed that a scientific theory of cultural evolution that aims to ape Darwinian evolution is impossible because human beliefs and behaviors are so unpredictable and subject to historical contingencies as well as sudden breakthroughs, discoveries, and … Read more
Number of words: 222 The very fact that people decide to live in the same patch, rather than dotted around at random, has to do with cooperation. Why? Some believe, for example, that the first communities evolved as a result of success in agriculture: surplus food from farming enabled people to settle down and specialize, … Read more
Number of words: 251 Karl also had plenty of anecdotes to underline why indirect reciprocity is just as relevant to everyday life as the direct version of reciprocity. He pointed out that the Rothschild family had protected the investments of their English clients during the Napoleonic Wars. They were under intense pressure to give them … Read more
Number of words: 625 Exploring the indirect form of reciprocity is important because it is critical for society. Direct reciprocity—“I’ll scratch your back and you scratch mine”— operates well within small groups of people, or in villages where there is at ightknit community where it would be hard to get away with cheating one another. … Read more
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