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- 보이지 않았던 별과학동아 l1990년 09호
- moon was in the sky nearby. Robbins and Westmoreland believe that the star near the rabbit signifies that. Moreover, there are 23 rays emerging from the star and that may represent the 23 days ...
- 박테리아 광부들과학동아 l1990년 08호
- concentrations and get the metals out of them economically. The metals are never 'used up,' but they are spread out over the Earth's surface in lower and lower concentrations, and getting more ...
- 상처를 찾아라과학동아 l1990년 08호
- The reason is simple. The original indication of the strike is a thin layer of rock 65million years old found all over the world, which is comparatively rich in the rare metal, iridium. Meteor ...
- 원자 하나씩과학동아 l1990년 07호
- through matter instead of being reflected, as light is. Also, X-rays could not be easily focused. The electron was discovered in 1896 and in 1923, an American scientist, Arthur H. Compton, show ...
- 종족의 보존과학동아 l1990년 06호
- the scale : the "hairy-eared dwarf lemur," a primate thought to be extinct since at least 1964, when a skin was turned over to scientists.The lemur is a primitive primate, the class of animals ...
- 우주적 위험과학동아 l1990년 05호
- water would reduce the cosmic ray radiation to the point that the risk of cancer would be increased by only 2 percent over that on Earth.This protection, however, might be inadequate in the cas ...
- 잘못된 경종과학동아 l1990년 05호
- of energy by the process.Another false alarm went off some time ago, when a "fifth force" of the universe was discovered. There are only four known forces in the universe and they seem to accou ...
- 작은 꼬인 빛 Tiny Twisty Light과학동아 l1990년 04호
- 천문학의 가장 큰 수수께끼의 하나는 잃어버린 질량의 신비다. 지난 1월 몇몇 천문학자들은 잃어버린 질량은 어느 정도 볼 수 있게 할 수도 있다고 안했다.잃 ... such is the scientific frustration over this "mystery of the missing mass" that there is bound to be ...
- 두 사람과학동아 l1990년 03호
- is that the latter was far more advanced technologically.In 1878, a Spanish archaeologist, Marcellino de Sautuola, discovered paintings on the ceiling of a cave. (Actually, his 12-year-old daug ...
- 1990년대의 과학과학동아 l1990년 03호
- in the 1990s.Of course, the true interest in future developments of science lies in the "breakthroughs"-sudden discoveries that seem to come out of nowhere and that turn some branch of science ...
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