- There are way more STEM graduates in China by a wide margin
- 18/20 of top universities in the world for chemistry research is in China according to Nature, including one of the attempts by USTC (#2 ranking): https://www.nature.com/nature-index/institution-outputs/gene...
- Supply chain is faster in China for chemicals and materials
- China has more money/equipment for this sort of stuff
- China is on average, more pro-science than the rest of the world