Last week was the last week most shows aired all new episodes in 2018. Regrettably, none opted to book science and/or technology related guests.
As I write this, the Science Channel is running its annual megamarathon of MythBusters episodes. New for this year is a slight deviation from airing the episodes in order. Each night the megamarathon will run several episodes along a common theme (holidays, duct tape, myths from movies and television, etc.).
The megamarathon will run until January 2nd, when MythBusters Jr. premieres. Adam Savage returns to guide a group of young people (teen and pre-teen) as they bust myths and such.