According to Edward Dowd, he asked Grok to compare the AI bubble with the 1800s railroad bubble and the answer highlighted three shared features: speculative investment, transformative technology, and economic cycles. Source: Edward Dowd on X, Aug 19, 2025. The post did not include tickers, price levels, trading recommendations, or any mention of cryptocurrencies or direct crypto market impact. Source: Edward Dowd on X, Aug 19, 2025.