Benin, Ghana, Rwanda test cross-border digital ID system  |  Cassava integrates NVIDIA’s Nemotron AI models into African platform  |  Scientists create drug that mimics exercise benefits  |  Samsung expands massive South Korean chip complex  |  New implant helps restore vision in patients  |  Breakthrough in frozen pig kidneys and nuclear power boosts  |  Kids evade social media age restrictions easily  |  Scientists revive pig kidneys after year-long freezing