NASA’s Rover Ends Mission after 15 Years The American space agency NASA had expected its rover called Opportunity to operate on Mars for just 90 days. But the vehicle kept exploring for 15 years after landing on the red planet. Opportunity landed on Mars in level = 10 1:12 Nelson Dellis wins USA Memory Championship again! level = 8 1:55 Angel! Look out! level = 29 1:09 I was ill last week level = 8 1:15 Scientists Say New Diet May Save Planet Scientists in London say they have found the best diet for both humans and the planet. level = 9 1:09 US Company Launches 'Zero-Waste' Shopping Model Environmental experts warn that our planet is drowning in plastic. level = 9 1:02 Scientists Launch Major Exploration of Indian Ocean Scientists are preparing to lead the first-ever major exploration operation in the Indian Ocean. level = 8 1:04 I want to be free Music level = 28 0:10 Listen-and-Write가 직접만든 최초의 영어 말하기 트레이닝 앱 - 1초 영어 트레이닝 출시
