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"Due to the decentralization of the blockchain, its applications are gradually broadening. Systems exposed in the public chains cannot be shut down, and bugs are extremely difficult to fix," Yu said. "As blockchain is evolving into a technical infrastructure service, serious security problems would occur once something goes wrong with it."

"E-commerce provides access so that both the consumer and the producer can meet in a timely way. This provides a very efficient way to link the producer and the consumer. Many of these small e-commerce companies and small traders use e-commerce to link the market and producers. That is something new and it has solved many problems," Li said.

"Escalating trade tensions will invite retaliation targeted at our farmers and will raise the price of ag equipment and inputs. We are working to ensure that American farmers are making their voices heard so that we avoid a trade war," he said.

"Dogs can hear high-frequency sounds that humans can't. By using such sounds, police can give the animals orders in situations in which they don't want to be heard, or from long distances," said Xu, a trainer at a police dog training base in suburban Beijing that is home to about 270 dogs.

"Economic activity in states with the most significant increases in cases in recent days, including Arizona, California, Florida and Texas, appears to be rolling over," Mark Zandi, chief economist of Moody's Analytics, wrote Monday in an analysis.