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Lens vs Iron lung
Which invention? Pick one and see how the world splits.
What the votes say
The world is split down the middle between Lens and Iron lung: 50% each. Lens is #227 of the 300 inventions in the world ranking. Iron lung is #228, and #80 of the 101 from the 20th century.
Side by side
| Lens | Iron lung | |
|---|---|---|
| World rank | #227 | #228 |
| Year | — | 1927 |