Mostly it's an online CV, but I blog occasionally. Some entries that may interest HN are:
http://heffern.net/rob/index.php/2018/05/18/hello-world/ . How much should a Harvard Lotto ticket sell for?
http://heffern.net/rob/index.php/2018/08/25/ch-1-kismayo-som... Why the Somali coast is the most valuable real-estate in the Solar System