나무 숲

24강 1 Major long-term threats to deep-sea fishes, as with all life on the planet, derive from trends of global climate change. Although deep-sea fishes are generally coldwater species, warming of the oceans itself may not be a direct threat. Many of the deep-sea fishes originated during the early Cretaceous when the deep sea was warm, and the Mediterranean Sea, which is warm down to a depth of o..

23강 1 While the transportation infrastructure may shape where we travel today, in the early eras of travel, it determined whether people could travel at all. The development and improvement of transportation was one of the most important factors in allowing modern tourism to develop on a large scale and become a regular part of the lives of billions of people around the world. Technological adva..

22강 1 Among the most fascinating natural temperature-regulating behaviors are those of social insects such as bees and ants. These insects are able to maintain a nearly constant temperature in their hives or mounds throughout the year. The constancy of these microclimates depends not just on the location and insulation of the habitat, but on the activity of the insects in the colony. When the su..

21강 1 Some city planning experts called for legislation against texting while walking that would be followed by a deep change of norms. This recommendation is based on the assumption that this change is welcomed, but laws banning texting while walking failed in Toronto, Arkansas, Illinois, Nevada, New Jersey and New York. Meanwhile, high-tech firms are developing technological solutions to the p..

20강 1 In one experiment, children were told they could have one marshmallow treat if they chose to eat it immediately, but two treats if they waited. Most of the children, who ranged in age from 4 to 8, chose to wait, but the strategies they used differed significantly. The 4-year-olds often chose to look at the marshmallows while waiting, a strategy that was not terribly effective. In contrast,..