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"Curiosity has not determined the source of the organic molecules," said Jen Eigenbrode of NASA's Goddard Space Flight Center who is lead author of one of the two new Science papers.

"China's financial opening-up has already drawn a positive market response. This new round of opening-up will forge a level playing market environment for both foreign and domestic firms," Guo said.

"Customers in Hong Kong did not like cucumbers with thorns, and those in Russia thought our tomatoes were too juicy," he said, adding he then realized that people from different places had different eating habits for vegetables, so their demands varied.

"Consumer trends show that there is a growing need for people to take care of their health. Keeping people healthy is widely recognized as one of the best ways to counter the rising cost of treating the sick," said Jakobs.

"Considering total global production capacity, there is a gap between mask supply and demand. In addition to speeding up production and increasing market supply, we also need to improve efficiency of the use of masks and reduce waste," Ou added.