X-rays

X-rays were discovered unintentionally while working with cathode-ray tubes, leading to the observation of radiation penetrating matter. The discovery spurred significant interest and further research on electromagnetic radiation.
 Wilhelm Röntgen Germany 1895 X-rays

X-rays were discovered unintentionally while working with cathode-ray tubes, leading to the observation of radiation penetrating matter. The discovery spurred significant interest and further research on electromagnetic radiation.