my dad is an INTP and his brother is an ISTP... they're both in their 60s now and hang out all of the time
my dad is much more likely to actually sit down and read a scientific journal than my uncle, but both will read magazine articles on natural sciences quite happily and both are huge fans of NPR... my dad more for the news, my uncle more for car talk and wait wait don't tell me!
both enjoy working on cars, but my uncle is more likely to start in on it without looking at the auto manual and my dad is more likely to at least know where the manual IS
my uncle is a trivia junkie to the point of collecting books on random trivia... my dad is more likely to read an actual book... though he's the slowest reader on the planet because he tends to savor books.
my uncle's ideas of proper ways to entertain children included motorcycle rides, tubing behind his boat or a trip to the hands on science museum for kids... my dad was more likely to actually conduct scientific experiments with you, take you out at night with a telescope or take you to the adult museum...
the ISTP was an autoworker who never went to college, the INTP went to college, rebelled against the system and became a small farmer because he was tired of having to be a part of the system... then he got mad at the agribusiness industry and turned the farm into a nature preserve
Human beings make life so interesting. Do you know that in a universe so full of wonders, they have managed to invent boredom? -Terry Pratchett
The difference between INTP's/ISTP's, and also between ENTP's/ESTP's, IME, can *largely* (not completely) be reduced to the differences in Ne and Se. Compare and contrast Ne with Se, and you'll start seeing the differences between these types more easily when you interact with them.
I'm sure someone will blow up my theory and say it's something totally different than this but, again, this is just based on my own experience.
NTJ's are the only types that have ever made me feel emo.
ENP's are the only types that have ever made me feel like a sensor.
There are two great days in a person's life - the day we are born and the day we discover why. --William Barclay