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Inside the intake room, a sea of trustees descended on the men with electric shavers, stripping heads of hair with haste.

Inside old laptops, electric toothbrushes and shavers is a trove including steel, aluminium, copper, lithium batteries and even gold.

A single 5.2-ounce tube could have a daily shaver putting their best face forward well into the second half of next year.

The pair were surprised by some of what their competitors chose to haul in their backpacks — one person brought an electric shaver and chess set — and learned about themselves in the process of filming.

After watching someone tinker with an electric shaver, for instance, the A.I. must explain why the shaver did not turn on.