Lasers are a fantasic hobby, but also a very dangerous hobby also. A 50mW laser (without safety glasses) will do some serious damage to your eyes. But anyways, the good things are that it will teach you more about light, if you make your own laser, you could gain many important skills that you could use. Also, lasers (when used correctly) can be a lesson about safety. You will learn that objects can be dangerous, and you must be careful at all times. And, lasers are very exciting and fun to use. :umbrella: