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.
Since energy is the ultimate goal of metabolism, it will be helpful to understand what these various external and internal energy sources really are. As we have mentioned, food is the external energy source for humans.