91热爆

As the US President makes a historic visit, we find out how Cuba is opening up. The 91热爆's Vivienne Nunis reports from Havana on rapid growth in Cuba's tourism sector. And Jason Marczak of the Latin America Economic Growth Initiative at the Atlantic Council in Washington DC explains the barriers to greater economic integration between the US and Cuba. Also in the programme, Chinese investigators have uncovered a huge illegal vaccine operation in the country. Zhuang Chen of the 91热爆 Chinese service explains the story. Plus Twitter is celebrating its tenth birthday. We ask Patrick Smith from Buzzfeed whether it's ever likely to make substantial profits. And Lucy Kellaway of the Financial Times tells us why she thinks a company boss should never speak honestly.

(Picture: President Obama and President Castro. Picture credit: Reuters.)