My life unfolded

In the 1960's Duane D. Pearsall and his colleagues accidently discovered unique characteristics of ionization and smoke. This discovery led him to invent the first battery powered home smoke detector. Pearsall was instrumental in changing commercial and home building codes tp require smoke detection devices. Since the mid-1970's, the smoke detector has become a household savery device that has been widely credited for saving thousainds of lives. The smoke detector may be the most significant lifesaving innovation of the 20th century."