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时差N小时
- 时差N小时:地球磁场的变化(下)
- By calculating how old the rocks are where we find these ancient compasses, we can figure out how long ago the magnetized parts were locked in. That tells us w
标签： 时差N小时 时间：2011-11-15 编辑：beck
- 时差N小时:地球磁场的变化(上)
- You’re a polar explorer and you’ve just reached the north pole. The huskies are yapping, the cameras are ready and you’re just about to unfur
标签： 时差N小时 时间：2011-11-14 编辑：beck
- 时差N小时:数字零的由来(下)
- Older cultures like the Babylonians used a marker of some sort to designate the space where no number goes, such as what comes between six and nine in the numb
标签： 时间：2011-11-10 编辑：beck
- 时差N小时:数字零的由来(上)
- Did you know that the number zero was discovered by Hindu mathematicians around the sixth century? What? That's crazy! Zero is just a number. It's not somethin
标签： 时间：2011-11-09 编辑：beck
- 时差N小时:地球磁场改变的原因(下)
- Every so often, however, that regular motion is interrupted. Think of what happens when you stir that bubbling soup. It takes a few minutes for things to settl
标签： 时间：2011-11-08 编辑：beck
- 时差N小时:地球磁场改变的原因(上)
- On a previous show we discussed how, every 200,000 years or so, the north and south poles switch places. Not that the places themselves move—rather, the entir
标签： 时间：2011-11-07 编辑：beck
- 时差N小时:撕纸的秘密
- The way paper tears is related directly to how it is made. Most paper is made from wood fibers. Logs are chopped into wood chips, mixed with water and chemical
标签： 时间：2011-11-04 编辑：beck
- 时差N小时:冥想可以减轻疼痛吗?
- Scientists have found that mindfulness meditation, known as “Samatha Meditation,” could be reducing the pain that people experience. Fifteen research subject
标签： 时间：2011-11-03 编辑：beck
- 时差N小时:为什么会烧心
- The most common reason for heartburn is eating too much, so acid overflows into the esophagus. Lying down with a full stomach makes it worse because gravity ca
标签： 时间：2011-11-02 编辑：beck
- 时差N小时:跑步的秘密(下)
- But you’re still smacking your foot directly on the ground, without any padding. Wouldn’t this lead to more foot injuries? Possibly. And, of course, it takes
标签： 时间：2011-10-31 编辑：beck