Why Washington’s reflecting pool has gone from ‘US blue’ to algae green

The Lincoln Memorial Reflecting Pool ‌in Washington, DC has turned green with algae just weeks after it underwent a major multimillion-dollar renovation to make it shine an “American flag blue” colour.

On Friday, US President Donald Trump said on his Truth Social platform that the site had been vandalised, suggesting damage was done by “radical left lunatics”, but that the algae that had appeare...