I know people who were able to dunk in high school as teenagers and were very explosive. Than they started weight lifing regime, lifted hard for a decade (solid weights on compund movements), still can't really dunk no more, while they should be even more explosive.
Thing is, pylometrics is still nr. 1 for most explosivnes and also olimpic lifting, but not classis weight lifting, strength is not power.
+EDIT: This guy on the video does far more than just DL to achive what he does, he is also very competent at calisthenics, he does one leg hill jums and other extremely difficult exercises ... Claiming this is a product of solely DL is misinforming.
Americans seems pretty short nowadays compared to some countries in Europe, where average is near 5-11 and a few over 6'. Still a few short countries here in Europe too.
I am a soon to graduate CS student, while I know a lot of theory about algorithms, data structures, parallel processing, numerical methods , architecture etc., sites like codecademy/treehouse/codeschool are great supplement. At university I learned basics of programming in java/C but only used them in some theoretical projects to learn about some algorithm/concept. Those sites are great to get into more practical aspect of computing and if you know basics of CS are a great way to pick up new language/framework/field.
Keeping low body-fat % while maintaining decent amount of muscle is what is really challenging.