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1. " Oxygen first appeared in Earth's atmosphere about 2.

2. But oxygen didn't reach its current levels until about 400 million years ago.

3. Using computer simulations as a way to peer into the past, the researchers estimate that lichens and mosses could have produced about 30 percent of the oxygen on Earth around 445 million years ago.

4. However, this trend has stirred up the debate about how to save peach trees when there is such a high demand today.

5. State television reported that the bus was about 50 meters underwater.

6. "To simultaneously promote the world's largest coal mine (Adani) while pretending to care about the world's largest reef is an acrobatic feat that only a skeptical politician can attempt.

7. A study in the journal Nature found that about 30% of the reef's corals have died, the first time in two consecutive years of unprecedented coral bleaching along the 2,300-kilometer-long reef.

8. UNICEF's children's agency estimates the number of women married as children will increase from 700 million today to about 950 million by 2030.

9. The network will also create three to five mini-documentaries and 30-minute special programs about Hanoi while posting Vietnam articles on CNN’s Facebook page, its Twitter account and promotional programs.

10. The Vietnam Museum of Ethnology in Nguyen Van Huyen Street, Cau Giay District, about 10 km from Hanoi's center, is also organizing folk games to celebrate the Reunification and Labor days.