First hold the nail with the wide head by its shaft and push it head-first into the ball of clay. Then do the same with the small-headed nail. 首先将宽头钉的杆竖起，将其头朝下推入橡皮泥球。然后对窄头钉再重复一次。 T...
Whats So Special About A Sharp Knife? 锋利的刀刃有什么特别之处? Everyone knows that a sharp knife cuts better than a dull one, but do you know why, exactly? 众所周知，锋利的刀刃比钝刀更加锋利，但你知道原理吗? The...
Imagine a platform the size of your thumbnail,made of silicon, metal or glass. 试想它就如拇指指甲盖大小，材料是硅、金属或是玻璃。 The surface is covered with a thousand needles, each no bigger than aperiod at the end of a typ...
From fluvaccines to tetanus boosters, injections are amust in modern medicine. 从流感疫苗到破伤风针，注射在现代医学中是不可或缺的。 But do they always have to makeyou say Ouch? 但是它们是否就一定会让你尖叫呢？...
But before this process had been in place for a while, there wasn't enough oxygen in the air for things to burn. 但是，在此转化之前的一段时间，空气中没有足够的氧气可以燃烧东西。 In fact, of all the planets, moons, aste...
What is fire anyway? 火究竟是什么？ Well, fire is rapid oxidization. It's the energy released when oxygen atoms start combining with carbon and hydrogen atoms. 火，即燃烧，是快速的氧化反应。氧化反应是氧原子和碳原子或氢...
Many other brain areas lit up as well, such as memory formation, information integrationin other words, areas associated with decision-making. 许多其他的大脑区域也被激活，比如记忆形成、信息整合换句话说，与决策相关的区...
Marmosets are small primates. 绒猴是小型灵长类动物。 Think of a monkey with huge fuzzy ears. 想象一只有巨大、毛绒绒耳朵的猴子。 Primatologists have often wondered whether nonhuman males evaluated their potential mates, or...
One of the studies divided a group of seniors into two different six-month exercise courses one course consisting of aerobic exercise, the other consisting of stretching and toning. 其中一项研究将老人们分为两组：一组做有氧运动;另...
Stretching and toning are certainly important, but their benefits are different from that of aerobic exercise. 伸展和拉伸当然很重要，但是，这些运动对身体的益处与有氧运动不同。 Surprisingly, aerobic exercise isn't just...
More specifically, the study found that sleep sort of changes the brain's cellular structure. 更确切的说，该研究发现睡眠在某种程度上改变了大脑的细胞结构。 When the mice were asleep or anesthetized, the researchers found...
Dear A Moment of Science, 亲爱的《科学一科》栏目组： Why do we sleep? 我们为什么需要睡觉? I know this question has been debated by scientists and philosophers for centuries, but are there any hard and fast answers? 我知道科学...
In any case, in a recent experiment, scientists working with mice shut down their brains' ability to make new cells. 不管怎样，在最近的一次实验中，科学家们用老鼠进行实验，他们消除了这些老鼠们大脑生成新细胞的...
Scientists used to think that for all its complexity, the brain was pretty static. 科学家们过去常常认为，大脑因为其复杂性而呈现出静止状态。 Once the brain matured, it essentially stopped growing and changing. 一旦成熟，...
Those who smoked nicotine-free cigarettes didn't report as much satisfaction, which indicates that the nicotine itself plays a critical role in the interaction. 那些抽没有尼古丁香烟的人并没有感受到满足感，由此表明尼古丁在相...
