Saying "I don't know" is one of those throwaway phrases that we add in to buy ourselves more time to think. To delay or defer having to come up with something on the spot. But while it might seem harmless, it might actually be costing you something.
Read MoreLast week, after a particularly trying morning with the kids, I walked home after school drop-off with tears in my eyes. I was physically tired. Rushing around, packing lunches, filling water bottles, holding hands, and wiping tears takes a toll. But I was even more mentally tired.
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