What to know

• Braking was an issue, as the machines slammed into a thick mat that organizers placed several meters after the finish line.S1
• A humanoid robot ran 100 meters in 9.39 seconds at the opening ceremony of the second World Humanoid Robot Games in Beijing, beating Usain Bolt’s world record of 9.58 seconds, Xinhua News Agency reported.S2
• The five-day games demonstrate China’s progress in advanced robotics, with 51 events and more than 1000 competitions taking place, including running, table tennis and soccer.S3S4
• Humanoid beats Usain Bolt's 100m record at Beijing robot gamesS5