This recently posted YouTube video by UNSW Professor Norman J. Wildberger discusses the discovery of the quaternions by Hamilton and the subsequent discovery of

This recently posted YouTube video by UNSW Professor Norman J. Wildberger discusses the discovery of the quaternions by Hamilton and the subsequent discovery of the octonians. It's 59 minutes, 30 seconds long, and it was published on March 5, 2014: MathHistory18: Hypercomplex numbers https://www.youtube.com/watch?v=uw6bpPldp2A https://www.youtube.com/watch?v=uw6bpPldp2A [video]