Solving Nigeria's blood shortagepublished at 12:30 British Summer Time 29 August 2017
In emergency situations getting blood where it's needed most can be critical. The lack of efficiency in this process has led to an unnecessary loss of life In Nigeria.
That's inspired Temie Giwa-Tobuson to develop an app that connects blood banks to hospitals, and has built a network of moped drivers to ferry blood around Lagos.
Her story is part of the BBC's World Hacks Series: