An app-polling delay: Iowa’s caucus chaos

Technical glitches and “inconsistencies” threw America’s first Democratic caucuses into disarray. That will have political consequences, irrespective of the eventual winner. So-called bio-bots—tiny machines made from the stem cells of a frog—blur the line between the biological and the mechanical. And the children competing in Thailand’s elbows-and-all Muay Thai boxing. For full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/radiooffer