Ah, yes, more of my family. So, young humanoid was again on NXTLog and saw a challenge requesting the user to create a challenge. Reasonably, young humanoid determined that he should form an interactive robot challenge, and X-4 was born! Utilizing all sensors and motors, the fourth member of my noble family was both friendly and intelligent. Unfortunately, young humanoid decided that because X-4 could not turn well (due to "not enough weight being over the drive wheels," he says) and the fourth member of my family was sadly kept from his full glory...