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Among the biggest unknowns is when the confrontation began at the high school outside Houston between police and 17-year-old Dimitrios Pagourtzis, who authorities say opened fire on an art lab shortly after the first bell Friday morning. Pagourtzis wasn't hit in the attack even though officials have described him engaging in a drawn-out firefight with police.

Amazon’s new Echo Show connecting to a security camera. (Amazon Photo)

American Airlines, the world's largest carrier, and Fliggy, a travel service platform of Alibaba Group, announced on Tuesday that they will form a strategic partnership and provide travelers in China access to purchase the airline's services and products through Fliggy.

Among the total, technology brands dominate the list. US brands rose 12 percent in value year-on-year, and other brands declined 1 percent, except Chinese brands, which grew 1 percent. Thirteen of the global top 100 brands are based in China, up from only one brand, China Mobile, 12 years ago.

Among Generation-Z and millennial voters, Biden's numbers are generally the same as that of former presidential candidate Hillary Clinton in 2016.