I was thinking if I can make the cheapest solar panel ever!!! Sorry if I'm getting so ambitious. I just want to have a clean free electricity powered household.
There is no standard fire alarm across the world. People might be curious to know what the annoying sound was without thinking. Hotel guests could have been travelling for 40 hours straight and have not recovered their full faculties. I know it might seem daft, but if you compare the amount of different dial / ring tones on telephones, confusion for fire alarm bells is almost guaranteed!
RainX is to help keep the rain from building up on your windows, hence the name, RAIN-X. The reason a helmet or anything else fogs up is temperature and humidity. If you can get the face of the helmet warmed to the temp of your breath fogging won't be as much of an issue.
I'm no expert, but over at Laser Pointer Forums (dot com) there has been a lot of discussion of this. The consensus seems to be that at 30mW just looking at the dot can risk eye injury. I have a 50mW green laser pointer, and it looks too bright for safe indoor use without safety goggles.
