Nobody wants Caterpillar Tractor and Deere at ten times earnings power because their earnings could fall off the cliff.

FORBES: Market Trends: I'll stick with growth stocks

Graham Nichols, a farmer in Kingscote, near Tetbury, said he had power tools stolen and crops damaged when a neighbour's tractor was taken.

BBC: Tractors worth ?2m stolen from Gloucestershire farms

Solenoid beams have already proven their "tractor beam" abilities in laboratory tests published in the journal Optics Express, but the pulling power of Bessel beams, presented on the preprint server Arxiv in February, remains to be proved experimentally.

BBC: Nasa examines 'tractor beams' for sample gathering