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- 가장 생명력이 강한 것과학동아 l1988년 03호
- evolved to that advanced stage of development 80 million years ago, bees must have formed long before that - perhaps another 80 million years before. This is of importance in connection with pl ...
- 가솔린 바다과학동아 l1988년 02호
- case, Titan and Triton may prove to be valuable resources. To be sure, the gasoline they will supply will undoubtedly not be needed for energy purposes because the distant settlements should, p ...
- 옛 괴물들과학동아 l1988년 02호
- Zealand that held their heads at heights of up to 13 feet and weighed up to 500 pounds. This is a height record, but not a weight record. Up to the 1600s, the "elephant bird," or "Aepyornis," w ...
- 시베리아에서 있은 폭발과학동아 l1988년 01호
- rich in iridium. That would account for the combination of the presence of iridium and the absence of a crater. Not everyone is going to accept that, though. The event remains a puzzle. Two poi ...
- 나무 달력과학동아 l1988년 01호
- course, long-lived trees are rare, but even short-lived trees can be useful if, for some reason, their dead wood did not rot too quickly. Oaks, for instance, live only a few centuries, but some ...
- 우리의 옛 선조들과학동아 l1987년 12호
- bones embedded in rock, then you determine the age of the rock, you will also have determined the age of the bones. Not all rocks have enough uranium in them to make a determination, but they a ...
- 책의 혁명과학동아 l1987년 12호
- screen's glow can be adjusted and softened. The electronic book won't bear much resemblance to a scroll. You may not be able to unroll in - or leaf through it - but it will never get dog-eared, ...
- 가장 중요한 화석과학동아 l1987년 11호
- museum will not allow it and insists that Hoyle's intended tests would prove nothing one way or the other.I myself am not impressed by Hoyle's claims. For one thing, I doubt that ...
- 1백억 광년 떨어진 곳에과학동아 l1987년 11호
- two galaxies do not exist all by themselves, There may be other galaxies in the vicinity that are not quasars, that do not have super-active centers, and that are therefore invisi ...
- 연료만들기과학동아 l1987년 10호
- then, catalysts or not, there will be no way of obtaining hydrogen.Is there anything that contains hydrogen that is not a fuel? Yes ― there is water, the weight of which is one-eighth h ...
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