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Biden, who leads virtually all early polls, is considered the premier moderate on stage. In addition to Harris and Booker, his more progressive opponents include New York Mayor Bill de Blasio, former Obama administration housing chief Julián Castro, Hawaii Rep. Tulsi Gabbard, New York Sen. Kirsten Gillibrand, Washington Gov. Jay Inslee and entrepreneur Andrew Yang.

Besides Peng's team, researchers at IBM company and Stanford University have also been developing carbon nanotube transistors.

Belt and Road countries and regions account for about 30 percent of the global economy, according to the Mercator Institute for China Studies. Projects worth some 0 billion are now either underway or on the drawing board, according to the China Development Bank.

Biden, a practicing Catholic, attended Mass with his wife Jill at their church near Wilmington, Delaware, before walking outside to visit the grave of son Beau, who died of brain cancer in 2015.

Biden has made clear that it will be a top priority for his administration to address the pandemic, which has infected more than 14.2 million people in the United States, with nearly 278,000 deaths.