My daughter (11) has developed another irritating habit. Whenever you say something to her she replies “I know” Your sister needs help. – “I know” We are late for school – “I know” E = MC squared – “I know” The cat is on fire – “I know”My preferred countermeasure to the "I know" mentality is to ask a question. You can quickly learn you don't know as much as you thought you did when you try to explain what you know.
Often attempts to encourage kids along takes more energy and especially if we are wiped out by work taking more energy to engage kids and help them discover cool knew things is hard.
A strategy for kids, or executives, is to have them predict and explain their prediction and then see what actually happens. After events it is easy to say "I knew" that would happen. Predicting before they happen is often not as easy.
If the kid takes on the I know role play the kid in the soap story below or this post on naturally curious children.
Related: Encouraging Curiosity in Kids - The Education System - Sarah, aged 3, Learns About Soap