translation.en: Now, the Earth's magnetic field is very, very weak; it's 100 times weaker than a fridge magnet, and yet it affects the chemistry -- somehow -- within a living organism.
translation.zh: 地球磁场非常的弱； 它比我们的冰箱贴还弱100倍， 然而它却影响着生物体中的化学反应。