How do scientists estimate crowd sizes at public events – and why are they often disputed? The Conversation

As we GrandmothersForRefugeesNSW get older and loose mobility, though never spirit, some of us managed to participate in this historic March for Humanity. It was cold, wet, and at times really hard, however as always we persevered……..

Last Sunday, tens of thousands marched across the Sydney Harbour Bridge in support of Gaza. But exactly how many people were there depends on whom you ask.

Police put it at about 90,000. Organisers claimed up to 300,000. Other reports and expert estimates landed somewhere in-between.

Why are these accounts so different and how hard is it, really, to estimate the size of a crowd?

How do scientists estimate crowd sizes at public events – and why are they often disputed? The Conversation