Nigeria accounts for 29% of global maternal deaths - a lack of medics and poor facilities are partly to blame.
The Microsoft founder urges young innovators to use Artificial Intelligence to improve health services.
As part of the deal, the UK will secure lucrative investment projects in the 2030 World Cup.
Kano State declares Monday as a day of mourning after 22 people died a road accident while returning from a sports festival in south-west Nigeria.
The army says it defended its post "vigorously" but eventually withdrew, as militants seized on their base.
Rose Njeri developed a tool to help people oppose the government's finance bill.
The law allows for land to be seized without compensation in rare cases and 'in the public interest'.
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