https://thewedgemethodai.com/sourceandpace https://thewedgemethodai.com/sourceandpace/ep02https://i.ytimg.com/vi/MRjUPsPtzU4/maxresdefault.jpgChina's High-Speed Rail Hit 50,400 km. What Failed at Wenzhou in 2011?CORRECTION (7 Oct 2026): the network chart (shown four times, near the 1-minute and 9-minute marks) labels every figure except 2017 (World Bank) as a China Railway figure. The 2012 (9,000 km) and 2022 (42,000 km) figures were stated by National Railway Administration head Fei Dongbin (The Paper, quoting Xinhua, 13 Jan 2023). The numbers are unchanged. 23 July 2011, near Wenzhou: a train doing 99 km/h ran into the back of another; 40 people died. China Railway counted 50,400 km of high-speed line at the end of 2025. How it was built (slab track and millimetre limits), what the official investigation found failed that night, why the slowdown began before the crash, and the bill that followed. Every claim is sourced on screen.https://www.youtube-nocookie.com/embed/MRjUPsPtzU47562026-10-07T04:26:20Znono https://thewedgemethodai.com/sourceandpace/ep03https://i.ytimg.com/vi/c3mTO5RONRQ/maxresdefault.jpgWhy the Three Gorges Ship Lift Weighs the Same With or Without a ShipHow does the Three Gorges ship lift raise ships up to 113 metres? Once its water is reset, the Three Gorges ship lift's tank weighs the same with or without a floating ship, so one danger its designers planned for runs the other way: losing the water. From the designers' own papers: the counterweights, the nut columns that hold the tank if it drains, and the five-step locks. From geologists' studies, official figures and state media: what raising the river cost (the 2003 Qianjiangping landslide, officially 1,310,300 people moved, sediment), up to the second staircase that state media say began construction in June 2026.https://www.youtube-nocookie.com/embed/c3mTO5RONRQ8192026-10-09T03:06:31Znono https://thewedgemethodai.com/sourceandpace/ep04https://i.ytimg.com/vi/PlSnz3cFQaA/maxresdefault.jpgCanadian Ice Road: Why Loaded Trucks Are Held to 25 km/h on Its LakesThe Tibbitt to Contwoyto Winter Road, an ice road in the Northwest Territories, is rebuilt across frozen lakes for each season it runs, and its operator's rules hold loaded trucks on the lakes to 25 km/h. One reason is how floating ice responds to a moving load, studied with satellite measurements of trucks on Gordon Lake in 2015. In September 2026, the operator said it was not planning a road program for 2027, while leaving open a possible restart.https://www.youtube-nocookie.com/embed/PlSnz3cFQaA7042026-10-09T00:00:56Znono https://thewedgemethodai.com/sourceandpace/ep06https://i.ytimg.com/vi/cE1Y7RwQjn8/maxresdefault.jpgWhy the Highest Bridge on Earth Is in China's Guizhou ProvinceThe Huajiang Grand Canyon Bridge in Guizhou province, south-west China, opened to traffic on 28 September 2025; its road runs 625 metres above the river, according to the provincial government. In April 2026, Xinhua reported that Guinness World Records had listed it as the highest bridge, at 626.01 metres, and said the height data came from Chinese surveying technology; we have not found an independent survey of the height. This video works down from the deck through the cables, the wind and the canyon walls to the river and the bill: about 2 billion yuan for the bridge, a figure from the Liu'an Expressway Company reported by Guizhou Daily in May 2023 (about 298 million US dollars at the Federal Reserve's rate on 2 October 2026; an estimate from before the bridge was finished), and about 24.5 billion yuan, the provincial transport department's 2021 estimate for the whole expressway, not the bridge alone.https://www.youtube-nocookie.com/embed/cE1Y7RwQjn802026-10-11T21:57:36Znono