It would appear that his scientific genius had still not emerged, but it did so suddenly when the plague closed the University in the summer of 1665 and he had to return to Lincolnshire. There, in a period of less than two years, while Newton was still under 25 years old, he began revolutionary advances in mathematics, optics, physics, and astronomy.
Tundub, et tema teaduslik geenius ei olnud veel tekkinud, kuid ta tegi seda ootamatult, kui katk lõpetas ülikooli suvel 1665 ja ta tuli tagasi Lincolnshire.