As Neils Bohr showed, it is possible for electrons to move between energy levels. Light contains energy. If a photon of light strikes an atom, it is possible for the energy in the light ray to be transferred to one of the low energy electrons moving around the atomic center.
Spotting before a period is due â reasons for spotting before a period can be implantation, from a cyst or a short luteal phase and impaired egg quality. Spotting in between cycles â this is a difficult term to answer but often means your cycles are growing shorter; often with perimenopause.
What does it mean if your period is 12 days late? A: Late or absent menstrual periods can be caused by pregnancy, stress, travel and drug use, according to WebMD. Birth control pills and medical conditions such as polycystic ovary syndrome can also cause missed or irregular menstrual periods.