Twitter co-founder Jack Dorsey says his technology firm Block is laying off almost half its workforce because artificial intelligence (AI) "fundamentally changes what it means to build and run a company." "Intelligence tools we're creating and using, paired with smaller and flatter teams, are enabling a new way of working," he wrote in a note to staff. The layoffs will mean the headcount at the company - which owns Square, CashApp and Tidal - will fall to less than 6,000 from 10,000. Block has

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