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More than 8 million unregistered SIM cards have been blocked in Ghana. The Ministry of Communications and Digitisation set a final deadline for mobile phone users to link their SIM card to their identification cards and now those who have not been able to register cannot use their SIMS. Opposition parties and civil liberties groups are protesting as the SIM needs to be registered with the biometric Ghana Card. The scheme has been full of delays, but it looks as though the government is standing firm this time. BBC reporter in Accra Thomas Naadi is on the show.Heart attack on a chip Researchers at the University of Southern California have developed a “heart attack on a chip” to ultimately test new drugs and even personalise medicines. Prof Megan McCain and Dr Megan Rexius-Hall speak to Gareth about how the chip can monitor oxygen imbalances that happen in the heart during an attack. The heart muscle doesn’t regenerate as well as other tissue in the body, meaning patients are often tired and do not recover to