There is a great book out there: Body Language by (forget the first names) Pease. It shows how to tell if someone is lying to you and the signals are truly cross-cultural. The entire culture where we live is thieving/lying. Armed with the insights from this book, I can ask my homeschoolers if they know where such-and-such is and can instantly and accurately ascertain if it was stolen and who stole it.

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Mary Vanderkooi
Kale Heywott Church (KHC)
Soddo, Ethiopia