Max Pearson presents a collection of this week's Witness History episodes from the BBC World Service.
We find out about the landmark protest in 1990 when wheelchair users crawled up the steps of the US Capitol Building in Washington DC, campaigning for disability rights.
Our expert is Dr Maria Orchard, law lecturer at the University of Leeds, who has carried out research into disability and inclusion.
We hear about the 2015 attack on the Bardo Museum in Tunisia's capital, in which 22 tourists were killed.
Next, the Gambian woman who in 1997 began making bags and purses out of old discarded plastic and is now globally recognised as Africa's Queen of Recycling.
The South African musical King Kong which opened to critical acclaim in 1959 and whose all-black cast defied apartheid.
Finally, the invention of the Global Positioning System - GPS - in the late 1970s, which now keeps aircraft in the sky and supports banking transactions.
Contributors:
Anita Cameron - disability rights campaigner Dr Maria Orchard - lecturer in law at the University of Leeds Hamadi Ben Abdesslem - tour guide Isatou Ceesay - environmental campaigner Nelson Mandela - former President of South Africa Marian Matshikiza - daughter of Todd Matshikiza, jazz pianist and composer Professor Brad Parkinson - chief architect of GPS
(Photo: 8 year-old Jennifer Keelan crawls up the steps of the US Capitol, 12 March 1990. Credit: AP/Jeff Markowitz)