文章列表

• 1.【英语时差8,16】睡觉=休息？（下）
• Human beings are diurnal creatures. That means we are normally active during daylight hours, when our senses function most effectively. At night, huma...
• 2.【英语时差8,16】睡觉=休息？（上）
• Its such a commonplace event that you probably never asked yourself why you sleep. But from a scientific point of view, this is far from a mundane mat...
• 3.【英语时差8,16】历史最悠久的甜味剂（下）
• But the reason honey helps keep baked goods fresh has to do with the ability of sugar to attract and hold onto water molecules. All these sugars are h...
• 4.【英语时差8,16】历史最悠久的甜味剂（上）
• Honey has been around for a very long time. Cave paintings in Spain from over ten thousand years ago show people harvesting honey. Today honey is most...
• 5.【英语时差8,16】蜂蜜：天然保鲜剂（下）
• So because of its high sugar concentration, pure honey will never ferment or go bad. It may crystallize but by soaking the jar in hot water you can tu...
• 6.【英语时差8,16】蜂蜜：天然保鲜剂（上）
• Leave it on the shelf too long and honey begins to crystallize. Heating the honey returns it to its original condition, but if you add water, you coul...
• 7.【英语时差8,16】同胞争宠（上）
• If you grew up with a brother or sister, you probably know what sibling rivalry is like. For a spotted hyena though, sibling rivalry is a matter of li...
• 8.【英语时差8,16】人类大脑的进化（下）
• Other anthropologists think its because meat-eating isnt the key at all, that the real key is cooked tubers, like yams. They say an increase in calori...
• 9.【英语时差8,16】人类大脑的进化（上）
• Our development of larger brains had much to do with our evolution as a species. But the question is, what fueled the development of those larger brai...
• 10.【英语时差8,16】鞋子里的GPS（下）
• But measuring movement is actually pretty tricky. Any small mistake in the measured acceleration results in position errors that grow with time. So ev...