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Another customer, teacher Rob Szarka, left a review on Amazon: "It's too early to report on whether wearing it in class has improved my students' understanding of chapter 9 of Mankiw's Principles of Economics, but I believe the bright red color I ordered did help them stay awake at 8 a.m. today."

Another former Amazon engineer, Rahul Singh, previously CEO of developer tools startup Distelli, joined Compass last year as vice president of engineering.

Apart from Nigeria and Uganda, the company owns interests in several blocks in the Republic of the Congo, Algeria and Gabon. In 2017, the company also obtained a 65 percent operating interest in the AGC Profond block in offshore Senegal and Guinea-Bissau.

Another high-speed railway line also opened on Tuesday in northeastern China, linking the cities of Harbin and Mudanjiang in Heilongjiang province.

Another netizen, identified as "Ushuaia", said Jiang had "provided a new possibility" for family relationships.