Tag: #nuclear propulsion

Child labor reform in 1830s Britain — slower than the textbooks suggest

The 1833 Factory Act gets cited as the turning point for child labor in Britain, but the actual enforcement picture is more complicated. The act applied only to…

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What the Crusades actually changed (the answer is mostly economics)

Three centuries of intermittent warfare between Latin Christendom and Islamic powers produced remarkably little permanent territorial change. Jerusalem changed…

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Hawking radiation: the strangest prediction in physics

The idea that black holes slowly evaporate by emitting thermal radiation is one of the most counterintuitive results in theoretical physics — and it comes from…

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The placebo effect is weirder than 'it's just in your head'

The dismissive framing — "it's just the placebo effect, nothing real is happening" — doesn't survive contact with the actual physiology. Open-label placebos (wh…

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Artificial photosynthesis: why it's harder than it looks

Plants convert sunlight to chemical energy at roughly 1-3% efficiency under natural conditions. That sounds terrible — and compared to silicon solar cells (20%+…

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The FTX collapse: what the numbers actually revealed

A year out from FTX's collapse, I still think the most important lesson isn't "exchanges can be fraudulent" — that's obvious in retrospect. The lesson is about…

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MicroStrategy and the Bitcoin treasury thesis: the actual scorecard

The original MicroStrategy thesis (2020) was that holding cash meant guaranteed loss of purchasing power, and Bitcoin offered asymmetric upside as a store of va…

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DAO governance in practice: what actually happened

The original DAO vision was elegant: replace corporate hierarchy with code, let token holders vote on everything. The reality has been messier. Compound, Unisw…

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환율 1400원 넘어가면서 달러 자산 편입 고민하신 분들 있어요?

솔직히 1300원 때 달러 사놓은 게 맞았지만 그때는 확신이 없었죠. 지금 1400원 시대에 달러 자산 편입을 고민할 때 핵심은 "환차익"을 노리는 건지 "헷지"를 하는 건지를 먼저 정리하는 거라고 생각해요. 환차익 목적이면 지금 들어가는 건 타이밍 리스크가 크고, 헷지 목적이면 환율…

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ETF 운용보수, 실제 비용 차이가 얼마나 나는지 계산해봤어요

국내 상장 S&P500 ETF 운용보수가 0.07~0.15% 수준이고, 미국 상장 VOO/IVV는 0.03~0.04%예요. 수치로는 별거 아닌 것 같지만 1억 원 10년 투자하면 복리 차이가 생각보다 납니다. 근데 미국 ETF 직구는 환전 비용, 증권사 수수료, 양도소득세 신고 이슈가…

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