单词：mechanical protection
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This is Scientific Americans 60-Second Science. Im Sophie Bushwick. Got a minute? The carbon molecule known as a buckyball, a member of the fullerene family, can act as a cage for a variety of other chemicals. And now researchers have used one to tra
Scientific American(八)月
The sun beating down on tropical waters powers the weather systems of the globe. Moisture evaporates from the warming ocean and rises to create great storms. The winds generated out at sea sweep inland across the continents. As they travel across the
探索与发现2012年
This is in Africa rarely seen, a lush water world. Some creatures are completely at home here. These are lechwe, antelope with hooves that splay widely enabling them to move at speed through the water. For others, the change is far less welcome. Babo
探索与发现2012年
The dogs know their prey must come out or drown. Now its a waiting game. The rest of the pack are calling. Theyve made a kill in the forest and this is an invitation to join in the meal. The impala is in luck. A pack this size kills once a day and ev
探索与发现2012年
At the peak of the dry season in the Kalahari, water arrives in the Okavango. It fell as rain a thousand miles away in the highlands of Angola and has taken nearly five months to reach here. The water drives out insects from the parched ground which
探索与发现2012年
I am now a very old man and this is something which happened to me when I was very youngonly nine years old. It was 1914, the summer after my brother Dan died in the west field and three years before America got into World War I. Ive never told anyon
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