Which university is the best in the world in the STEM subjects? 

There are several universities that are considered to be among the best in the world for STEM (Science, Technology, Engineering, and Mathematics) subjects. The exact ranking may vary depending on the criteria used and the specific field within STEM.

However, some of the top universities that are commonly ranked highly for STEM subjects are:

1. Massachusetts Institute of Technology (MIT)
2. Stanford University
3. California Institute of Technology (Caltech)
4. Harvard University
5. University of Cambridge
6. University of Oxford
7. ETH Zurich - Swiss Federal Institute of Technology Zurich
8. University of California, Berkeley
9. Imperial College London
10. University of Chicago

Again, the exact ranking may vary depending on the source and the specific criteria used, but these are all highly regarded institutions for STEM education and research.