Sentence:  For if I <WSD>knew</WSD> the secret of letting this power in my body change directly into electricity , I could rent myself out to the electric companies and with just the power in my body I could light all the lights and run all the factories in the entire United States for some days . 
Meaning of the word marked with <WSD> tags:  be cognizant or aware of a fact or a specific piece of information; possess knowledge or information about