What is the most expensive thing in the world by weight?

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Question: What is the most expensive thing in the world by weight?

Answer: Antimatter is considered the most expensive thing in the world by weight, according to a 1999 article by NASA. The cost of antimatter is approximately $62.5 trillion per gram, which is equivalent to $1.75 quadrillion per ounce. Even with improvements in equipment to trap antimatter particles and reduce the cost, it is estimated that it could still cost around $5,000 per microgram.

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