question: What were the celebrants honoring with their commemorations ?
answer: They celebrated the ideas which `` over the last 150 years have revolutionised our understanding of nature and our place within it '' .
turker_answer: The celebrants celebrated the ideas which `` over the last 150 years have revolutionised our understanding of nature and our place within it '' .
rule-based: The celebrants honoring with their commemorations were they celebrated the ideas which `` over the last 150 years have revolutionised our understanding of nature and our place within it '' .