At 13 months my granddaughter discovered something remarkable. She stood between a curtain and a bed and noticed that a ray of sunshine came through the window onto the bedspread. So she closed the curtain and saw that the sun rays disappeared; then she opened the curtain and noticed that the sunshine came back onto the bed. Back and forth she moved — light, no light, depending on what she did with the curtain.

At small and large conferences I have recently addressed I showed this short video and asked the audience: what scientific principle had Zara just discovered? Perhaps not surprising, none of these accomplished people could come up with the answer, except for a Werksmans lawyer at a company breakaway. Cause and effect, of course.

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