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The original was posted on /r/todayilearned by /u/UnlikelyOpposite7478 on 2025-08-13 07:09:20+00:00.

Original Title: TIL that Tritium, vital for fusion fuel like in ITER, is extremely rare with only ~20 kg made yearly from CANDU type heavy-water reactors. It costs about $30 000 per gram, so most fusion projects plan to breed it from lithium due to huge supply shortages.