As many prepare for a long weekend of family, friends and fun, it's worth remembering that the rationale for Labor Day begins and ends with a celebration of workers.

The holiday's origins lie in early battles for better pay, hours and working conditions. Today's challenges are in many ways more complex and intractable, and are enveloped by an uncertainty about how the very nature of work is evolving.

Artificial intelligence and other technological advances are redefining or replacing many jobs. Planning for new workflows and training workers for new skills will be daunting, whether the employees sit in offices or load trucks.

Technology moves far faster than people, and it hasn't been easy to keep up. In its annual Future of Jobs report, the World Economic Forum analyzed "skill instabil

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