• Moonshot!. An app made in Geogebra to commemorate the launch of Apollo 11 on 16 July 1969. It simulates the famous “figure-eight” trajectory which guaranteed the astronauts a free-return home, if the rockets failed on the way to the moon. There is also a stand-alone version.

• South Africa’s voter turnout: what the numbers really tell us. Long form of article published at The Conversation about voter turnout in the South African 2019 elections. I was also interviewed on Cape Talk.

Some mathematical blog posts in recent years:

• Feynman’s Fabulous Formula, n-Category Café, 29 Jun 2015.

• The Modular Flow on the Space of Lattices, n-Category Café, 7 April 2014.

• Quasistrict Symmetric Monoidal 2-Categories via Wire Diagrams, n-Category Café, 10 Sep 2014.

I also have a Math Overflow account.