Imagine a future in which millions of families live off the grid, powering their homes and vehicles with dirt-cheap portable fuel cells. As industrial agriculture sputters under the strain of the spiraling costs of water, gasoline and fertilizer, networks of farmers using sophisticated techniques that combine cutting-edge green technologies with ancient Mayan know-how build an alternative food-distribution system. Faced with the burden of financing the decades-long retirement of aging boomers, many of the young embrace a new underground economy, a largely untaxed archipelago of communes, co-ops, and kibbutzim that passively resist the power of the granny state while building their own little utopias.

Scientists have read the minds of healthy volunteers using a brain scanner to detect what they were thinking. By placing the volunteers in the scanner after they had been shown three film clips, the researchers were able to tell which clip they were recalling.

The advance brings a step closer the prospect of a “thought machine” to detect what a person is thinking from their brain activity pattern. But the technique is still at an early stage of development and its capacity to discriminate between “thoughts” is limited.