Wikipedia has some pertinent info: Laser pointer. It depends on the power output of the laser, interesting stuff about the blink reflex. I'm not a medical professional, but it sounds like shining lasers in your eyes is a bad idea regardless! This is not as pertinent; I dislike the way the question is phrased.
The ultimate source of all energy on earth is light from the sun. Plants use that energy, along with carbon dioxide from the air and nitrates from the soil, to create sugars aâ¦nd lipids (fats) as well as amino acids (ingredients for DNA) through the process of photosynthesis.
Deep within the bowels of the earth there are bacteria whose sole source of energy come from hydrothermal activity of the earths core, so we can rule out the sun theory. As far as I can tell, if you keep tracing back the source to some common ancestor, the deeply unsatisfying answer is that the ultimate source of energy is... energy.