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The 'Southern Cross' reaches Sydney, 1928

TLF-IDR2925

This is a black-and-white photograph of the 'Southern Cross' biplane arriving in Sydney and being greeted by reporters and photographers and a large contingent of police after the record-breaking flight of Charles Kingsford Smith and his crew across the Pacific. Signed portraits of the crew are superimposed upon the photograph, ...

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Can photons and atoms generate laser?

TLF-IDM019618

Electrons around atoms can absorb and emit photons of particular colours of light – see three different atomic models explain what's going on.