Anthropic IPO, Microsoft layoffs, a mouse brain injection: how well do you know this week's AI news?

Six quick questions on the week's biggest AI stories: billions, layoffs and an unusual lab experiment. How closely did you follow?

1. Roughly how many employees is Microsoft offering voluntary severance this year, for the second time?
2. How much does Microsoft plan to spend on AI infrastructure in 2026?
3. Into how many categories does the new ForTy map by DeepMind and WRI classify forests and other land?
4. What did an AI agent carry out in the Exin Therapeutics experiment?
5. Roughly how much of its $30 billion target has OpenAI raised so far, according to the WSJ?
6. How much revenue did Anthropic make in the third quarter of this year?