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Alphabet selling very rare 100-year bonds to help fund AI investment
(arstechnica.com)
This is a most excellent place for technology news and articles.
Traditionally, you need to find someone to loan you money with the bond as collateral. Then you promise that person the bond as repayment of the debt + interest, with the expectation that you can re-buy the bond at a future date for much less than you could today.