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- 생명체의 분류과학동아 l199012
- that may weigh up to 150 tons.(Some plants are heavier still but most of a tree is supporting woody tissue that is not truly alive, whereas animals consist almost entirely of living tissue.)In ...
- 금이 없다!과학동아 l199011
- and would pay off far less of the fraction of the national debt than you might suppose.Finally, what counts is not the total amount in the ocean but how thinly spread out it is, and it is very ...
- 도도새 같은 죽음과학동아 l199011
- injury of extinction.As an example of the interrelationship of species, there is a tree on Mauritius whose seeds will not germinate unless the fruit has first passed through the digestive track ...
- 발 달린 고래과학동아 l199010
- And though 10 million years had passed, it still had hind legs. Not much to be sure, but the bones are there and cannot be mistaken. If they were stretched out in a straight line, they ...
- 슈퍼 다이아몬드과학동아 l199010
- beaten!Unfortunately, carbon-12 diamonds are even more expensive than diamonds ordinarily are, so they probably will not be used on a large scale. However, there are bound to be small-scale use ...
- 보이지 않았던 별과학동아 l199009
- the appearance of the bright star of 1054.The supernova of 1054 was sufficiently spectacular, however, that it need not have been reported only by astronomers in nations with advanced technolog ...
- 마지막 입자과학동아 l199009
- Associated with the W — particles mentioned above is the "Higgs particle" about which very little is known. It has not been detected so far. And, of course, there may be other particles that p ...
- 상처를 찾아라과학동아 l199008
- been able to examine the deposit of shocked quartz for themselves. Negotiating permission to work in a hostile Cuba is not easy, so they are forced to go by second -hand descriptions.Neverthele ...
- 박테리아 광부들과학동아 l199008
- be more than that. We might, conceivably, set them to work on metal scrap which has been discarded by us and which cannot be profitably recycled.The industrious little bacteria may live on the ...
- 원자 하나씩과학동아 l199007
- atoms in such a way as to form substances built up of specific combinations("molecules") of atoms, substances that cannot be formed by ordinary chemical means.In addition, it may be that the mi ...
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