![[Tech] 프로펠러 없이 하늘 난 비행기](http://dl.dongascience.com/uploads/article/thumbnail/201901/S201901N030-img.jpg)
power from a lithium-polymer battery. The thin filaments are called emitters, and are nearer the front of the plane. Around these emitters the electric field is so strong that the air gets ionized – neutral nitrogen molecules lose an electron and become positively charged nitrogen ions. Farther back on the plane we place an airfoil – like a small wing – whose leading edge is ...
![[Issue] 양서류 흑사병 발원지가 한국?](http://dl.dongascience.com/uploads/article/thumbnail/201807/S201807N019.jpg)
on ships or planes, for example, in exported produce or materials. So possibly, Korean frogs spread deadly disease around the world. But this does not imply that amphibians outside Asia are doomed to extinction. Some species, like Archey’s frog, already have evolved resistance to the disease. Even among susceptible species, some individuals are able to survive infection. When the survivors ...
![[Issue] ‘지진의 나라’ 이탈리아는 지금, 인공위성으로 지진 모니터링](http://dl.dongascience.com/uploads/article/thumbnail/201802/S2018201N036.jpg)
approximately every 30 years. As Earth’s rotation began one of these infinitesimally small periodic slow-downs around four years ago, we will soon know if these predictions are correct. 최근 미국 콜로라도대 지구물리학자들은 지구의 자전 속도가 느려지면 약 5년 정도 뒤에 강력한 지진이 발생한다는 경향성을 발견하기도 했다. 지구 자전이 ...
배경음악 ‘Ring Around the Rosie’를 들으며 시작합시다. 흑사병으로 죽은 아이를 묻으며 불렀다는 이야기가 있는 유럽 민요입니다. 장미를 뜻하는 ‘Rosie’가 흑사병의 증상인 발진을 의미한다는 거죠. 흑사병은 14세기 유럽에서 수천만 명의 목숨을 앗아간 전염병입니다. 민속학자들은 이 이야기가 ...
![[Issue] “저는 책 나르는 로봇 ‘어라운드’입니다”](http://dl.dongascience.com/uploads/article/thumbnail/201712/S2017112N028.jpg)
이 로봇은 예스24와 네이버랩스가 공동으로 개발한 자율주행 책 운반 로봇 ‘어라운드(AROUND)’다. 매장에 들어서면 가장 먼저 어라운드가 반긴다. 바퀴가 달려 있어 울퉁불퉁한 바닥도 잘 다닌다. 사람과 충돌할 위험을 줄이기 위해 어린이가 걷는 속도와 비슷한 초속 50cm로 천천히 움직이도록 ...
![[Issue] 고래사냥꾼 추적하는 ‘오션 워리어’](http://dl.dongascience.com/uploads/article/thumbnail/201712/S2017112N035.jpg)
they will simply move to another area.” Because the seas have no boundaries, Sea Shepherd’s campaigns take place around the world to ensure that the whales we save in Antarctica don’t die as by-catch in illegal driftnets in the Indian Ocean, or that sharks swimming in protected waters in the Galapagos don’t end up in soup bowls in China. Even when national laws, international ...
distance so that their ambient temperature would sustain liquid water. It was to search for these promising planets around small, cool stars that Harvard astronomer David Charbonneau, Berta’s mentor, founded the MEarth project, which uses small automated telescopes in Arizona to keep an eye on M-dwarfs, looking for the telltale dimming that would suggest a planet. GJ 1214b was the ...
unexpected and sometimes inspired connections to be made. So for the most people, jumping up from the bed and running around hurriedly in the morning does not help. Your stressful commute and reading news online won’t help either. The stress hormone cortisol can harm myelin, the fatty substance that coats our brain cells. Damage to these myelin sheaths slows down the speed with which ...
in Stanley Kubrick’s 1968 film Space Odyssey 2001. Digital Animation Way before Pixar, digital animation was hanging around us for long time. In 1965, Charles Csuri, a painter and member of the art faculty at Ohio State University, began using an IBM mainframe to morph and animate his drawings. It included a widely exhibited film of a hummingbird. Upper-listed four technologies make ...
led me to major in biochemistry.I would like to tell the readers of Children’s Science Dong-a to ‘question all around you̕! Why were there typhoons in Korea but not in Brazil? Here, you learn about geography. Or you can also ask why trees have the color green and sky blue? Then, soon you will find yourself a creative and insightful scientist." 해설노벨상 수상자들이 지난 ...
동아사이언스
디라이브러리
DS스토어
팝콘플래닛
