Not much--it still produces UV radiation.

Dilute them. They retain their strength (if by strength you mean pH), but they are less hazardous when at low concentrations. Hydrochloric acid is extremely dangerous in a 30% solution, but as a 1% solution you can get it on your hands and have no problem.

oh. by safer sex. safer abilities. & safer people. you know. ;)

That is the correct spelling of "safer" (more safe).

There is none and scientests cannot predict earthquakes yet or maybe never but they can measure them after one has happened. But so far there is no solution. But it is possiable to make your house safer from earthquakes.