Evolution Predicts the Flowering of Mustard Plants

Here’s another prediction: under prolonged drought, natural selection will lead to the evolution of plants that flower earlier than their ancestors. This is because, during a drought, soils dry out quickly after the rains. If you’re a plant that doesn’t flower and produce seeds quickly in a drought, you leave no descendants. Under normal weather conditions, on the other hand, it pays to delay flowering so that you can grow larger and produce even more seeds. This prediction was tested ...

 Food Stamps Improves Quality of Life for Children

Seizing on yet another natural experiment, Almond examined the impact of the introduction of the food-stamp program in the late 1960s and early 1970s. The program was rolled out on a state-by-state basis, allowing Almond to compare birth outcomes for poor women who received food assistance during pregnancy to those who did not. His results, published in The Review of Economics and Statistics, found that women who were enrolled in the program three months before they gave birth delivered babie...