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From Andy Green, Epsom, Surrey, UK

In the 16 May issue, I read about damming the Bering Strait to prevent the collapse of the AMOC on page 8, and about data centres floating in the ocean on page 11 (16 May, p 8). Why not kill two birds with one stone and use data centres to dam the strait?

For the record

The thin material in which a new quantum state of matter has been observed is made from carbon atoms in a hexagon pattern (9 May, p 5).