i assume also half life refers to how long the threat of radiation that remains but why are radiactive elements given half -lifes? what is the purpose of that rather than full life?
We are a manufacturer of contact lenses and we make our own saline. We use the follwing mixture: <UL> <LI>410g Sodium Chloride</LI> <LI>98g Di Sodium Hydrogen...
Do any of you know anything about them or where I can find stuff about them online because I'm doing a project on them and dont know where to look for things?
Apart from the price, what's the difference between cheap chrome-plated objects and 'real' chrome ones? What's the process of manufacture? I'm trying to buy some chrome 'grab rails' for my bathroom,...
