What's in a language? Dr Laurie Tratt breaks it down by creating a brand new programming language by writing an interpreter in a few lines of code. Computerphile is supported by Jane Street. Learn more about them (and exciting career opportunities) at: More from Laurie: Dr Laurence Tratt is programmer and the Shopify / Royal Academy of Engineering Research Chair in Language Engineering in the Department of Informatics at King’s College London This video was filmed and edited by Sean Riley. Computerphile is a sister project to Brady Haran's Numberphile. More at