A spokesperson for China's top health authority on March 21 briefed the media on the status of COVID-19 vaccination in the country. How many doses had been administered by March 20?

The photograph shows 300-million-year-old tree fossils discovered in China by an international research team led by Chinese scientists. Where were the fossils discovered?

The photograph shows a gold mask that was recently unearthed from a sacrificial pit at Sanxingdui Ruins in southwest China's Sichuan Province. How much does it weigh?

China has launched a key project which can advance global understanding and application of nuclear fusion. Called Helium-Cooled Ceramic Breeder Test Blanket System (HCCB-TBS), it is a crucial part of the "artificial sun" project. Which one of these best explains nuclear fusion?

According to a study published in The Lancet journal last week, about 40 percent of COVID-19 positive patients in central China's Wuhan City have antibodies that can offer protection against re-infection for several months. How many to be exact?

Yang Jiayu from north China's Inner Mongolia Autonomous Region last week broke the world record for 20-kilometer women's race during the national championships in east China's Huangshan City. What kind of race was it?