Plant fibre and laser: what they have in common

1. Step 1. Plant fibre — is material for — Carpet sweeper. The brush is bristle.
2. Step 2. Carpet sweeper — evolved into — Vacuum cleaner. The mechanization of cleaning.
3. Step 3. Vacuum cleaner — evolved into — Robot vacuum. An autonomous vacuum cleaner.
4. Step 4. Robot vacuum — has part — Lidar. Navigation by lidar.
5. Step 5. Lidar — has part — Laser diode. Laser pulses.
6. Step 6. Laser diode — is a kind of — Laser. A semiconductor laser.

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