Jimmy Wales and Larry Sanger launch Wikipedia, a free, online encyclopedia that is written and edited by volunteers.
It is based on a web app called the wiki, which allows people to add, change, or delete content in collaboration with others.
Wikipedia is the sixth most-popular site on the Web.
Preventing cavities gets easier with the 3M™ ESPE™ Clinpro™ Dental Sealant that bonds to the teeth.
Cured by light, the resin seals teeth to prevent decay.