1. Researchers at the University of Basel have developed a method to measure the exchange energy in molybdenum disulfide, a 2D semiconductor, to understand its ferromagnetic properties. 2. The exchange energy, crucial for the stability of ferromagnetism, was determined by analyzing spectral lines emitted from the material when excited by a laser. 3. The study highlights the potential of 2D materials like molybdenum disulfide in future technologies due to their unique physical properties.