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He's only 10 years old, but Jacob Heitmann has already put himself to work. An entrepreneur, he runs a successful business selling 3D-printed toys to classmates, on his website and in his Etsy shop, ...

About halfway through a brain-bending 45-minute range session with Jordan Spieth, I ask what might be a very dumb question. Spieth doesn’t hesitate, which suggests he’s thought plenty about this ...