Contagion is a medical term, but it applies to the banking world, too. Investors are worried that the problems at a handful of American banks could ripple across the world economy and that unexpected surprises may be lurking. And, Ecuador finds a novel way to convert seized cocaine into cement. Also, the outgoing head of the UN’s World Food Program, David Beasley, has long argued that growing global food insecurity should be addressed with structural solutions — not handouts. Beasley talks about how the world can adapt to the new, worrisome challenges hunger poses. Plus, the latest sounds from the innovator of the Hindustani slide guitar, Debashish Bhattacharya.