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Museum marketing manager Hannah Molloy said museum staff had given out 1000 wrist bands providing free access to the science centre by 1pm, and had provided another 1000 by 3.30pm.
People were ''very relaxed about waiting'' and long mid-afternoon queues had been ''moving steadily'', she said.
Science communicators had offered science demonstrations in the science centre, and more than 170 visitors - wearing safety glasses, and protected by soapy water on their hands - had briefly created ''human candle'' fires.