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"Dozens of tree species were planted and failed to grow due to the polluted earth, but the ones that survived, mostly drought-tolerant and adaptable trees, gradually took root by the thousands in the barren land," Dai said.

"Even when a crack is present, it does not immediately compromise the safety of the aircraft," Snook added.

"E-sports could also encounter problems like doping, because tournaments are so intense and require players to have excellent concentration and physical endurance."

"Extremely saddened by the bus accident in Pauri Garhwal, Uttarakhand. My deepest condolences to the bereaved families. I pray that those injured recover at the earliest," Modi said in a statement, tweeted by the Prime Minister's Office.

"During the current COVID-19 pandemic and future similar outbreaks, school closures may be an unpredictable and common feature of government responses. Under these circumstances, the well-being and health of home-schooled children must be safeguarded with innovative tools," Zheng said. "Our novel peer-to-peer live streaming intervention can significantly reduce anxiety and eyestrain in home-schooled children."