Jack Steinberger obituary on the RSEF

Ramon Pascual and Enrique Fernández have written an [obituary on Jack Steinberger](https://drive.google.com/file/d/1uMtX2W4Dz2L6HQorY4LmBf3P78DHq5y0/view?usp=sharing), which is published in the last issue of the RSEF’s Spanish Journal of Physics.