Even if all the bacteria that live in all animals are added up, they amount to about 1 per cent of the total. Most are not only harmless but vital, helping in such activities as digestion. ”
यह धूम्रपान करनेवाले आधे लोगों की जान लेता है जबकि पहले हम समझते थे कि यह एक - चौथाई लोगों की जान लेता है ।