The victims were attempting to flee a cholera outbreak on Mozambique's northern coast.
Russ Cook, nicknamed "Hardest Geezer", has finished his challenge of running the length of Africa.
President Paul Kagame addressed world leaders at a ceremony marking 30 years since the brutal killings.
Scientist Marie Makuate wants more African countries to have their own satellites orbiting Earth.
The extreme challenge began at South Africa's most southerly point on 22 April, 2023.
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