Knowledge Don't download unknown attachments that might be malicious software. The malicious neighbor spread the gossip. His photography expertise earned him a high-paying job. Since Jane has no expertise in gardening, she has singed up to take a few horticultural classes. Jackson could not fathom the solution to the complex puzzle. I cannot fathom why the boss just fired him. As far as I know, I don't think they could fathom this question. What's the best way to increase your knowledge? Read books and take free online classes are the best way to increase your knowledge. What is something you would like to have more knowledge about? I would like to have more knowledge about psychology. Psychology could explain human's behavior by theories. What is the most useful knowledge to have? Mathematics is the most useful knowledge. It's the gate and key of the sciences.