The menstrual cycle is from Day 1 of bleeding to Day 1 of the next time of bleeding. Although the average cycle is 28 days, it is normal to have a cycle that is shorter or longer. Girls usually start having menstrual periods between the ages of 11 and 14.
In nuclear physics, nuclear fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new nucleus. During this process, matter is not conserved because some of the matter of the fusing nuclei is converted to photons (energy).
Let us assume that cold fusion works like plasma fusion (hot fusion), converting deuterium into helium and releasing energy. Actually, it is probably more complicated than hot fusion, but broadly speaking it releases energy on the same scale, with roughly the same amount of fuel, and it does produce helium.