Ask HN: Introducing my son to programming

My 6 year old has an interest in science, maths and technology. I was wondering if I could introduce him to programming to see if he likes it. I'm aware of languages such as logo and scratch but was wondering if there are any others and, more importantly, if theres anything I should keep in mind or any techniques I should try?

Any and all advice appreciated. Programming and my love for it accelerated my learning in primary school and I was curious to see if my son has inherited the 'bug' :)