World’s ‘smallest steam engine’ built in Germany

The world’s smallest working steam engine has been built in Germany, according to a team of researchers.

The microscopic model was based on a 195-year-old design by the inventor Robert Stirling.

Changes included the replacement of the original pistons with a laser beam.

The physicists said they were astonished by how efficiently the machine converted heat into power — but said it did not run smoothly and had no practical use in its current form¬†— via

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