d라이브러리
"NOT"(으)로 총 234건 검색되었습니다.- 두 사람과학동아 199003
- but there is a strong suspicion that all human beings and their ancestors originated in Africa.We know of Neanderthals not only by their bones, but by the tools they left behind. Widespread ove ...
- 그것은 유전자 안에 있다과학동아 199002
- years . but it is only about 8 billion years ago that organisms made up of many cells formed. Perhaps evolution has not yet perfected the system of producing and managing a combination of many ...
- 화성을 다시 찾다과학동아 199002
- to be further evidence that the carbon-containing material must have originated on Mars.And why did the Viking probes not detect such material? Wright claims it wasn't chance. The probes scoope ...
- 경제교류가 가져오는 것 Business Leads The Way과학동아 199001
- these problems must also be global. No nation by itself can effectively deal with any one of them, if other nations do not cooperate. There are continuing international meetings on all such pro ...
- 지구가 너무 덥고 추웠을 때 When The Earth Was Too Hot and Too Cold과학동아 199001
- Fossil finds are few in those areas; the climate was probably so ferocious in central Pangaea that life simply could not stand it. This is especially likely since central Pangaea would have bee ...
- 없앨 수 없는 것(플라스틱)과학동아 198912
- instance.) That will be decomposed by bacteria and mold, and the rest will powder away and be easier to handle.That's not as easy as it sounds. You don't want to make plastics too easily biodeg ...
- 대 해빙과학동아 198912
- formed by a vast rush of water.He suggests that the ice-sheets did indeed melt very slowly, but that the water did not necessarily run off, soak into the sea as rapidly as it formed.Instead, wa ...
- 공룡의 죽음-열쇠가 되는 아미노산과학동아 198911
- the heat of impact? There is no easy answer to that. The amino acids are not very sturdy molecules and normally could not withstand such heat. Perhaps they existed on the inside of chunk ...
- 보다 정확히과학동아 198911
- enough." and go on to other things.That, however, they can never do. Every newly precise measurement merely brings another, more distant horizon, into view, one that must be striven for. After ...
- 20년후-달의 신비를 벗기며과학동아 198910
- the moon has developed less internal heat, and it is internal heat that keeps the crust moving and changing even if nothing else does. In other words, whereas the Earth geologically "alive," t ...
