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Africa’s early-stage startups are facing a new funding squeeze as venture capital firms increasingly prioritize backing proven companies over riskier young ventures in a bid to deliver returns to investors.

It is impossible to make large language models fully secure against hacks because of a fundamental flaw in how they work, a team of researchers argue in a paper presented at the International Conference on Machine Learning, a top AI conference, this month. The claim has huge implications for the safety of this technology, which…