A powerful rally has lifted Japan's Nikkei and Asian stock markets, and European and U.S. stock futures indicate they will follow too. Given the confluence of factors that drove the selloff - Japan's rate hike, an unwind of yen-funded global trades, weakness in U.S. jobs and Middle East tensions - strangely, all it took was a soothing message from central bank officials to turn things around. As Europe wakes up, the Nikkei is up 9%, nearly erasing the 12.4% decline on Monday that pushed it into bear market territory.