The biggest protest in human history was the global wave of rallies in February 2003 against the invasion of Iraq by the US, Australia, and the UK. Tanya gave this speech to 15,000 protestors in Canberra on February 15, 2003. (speech starts at 1:05)

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(Tanya references the widely-ridiculed Howard government initiative to spend $15 million sending fridge magnets to every household as part of a supposed anti-terrorist campaign, as well as moves by teachers to discuss the war in class.)