I teach from my tablet. I usually give out skeletal notes, so notes that are half filled in. I can pull up R and run some code so that students can see things in real time. Sometimes you do just have to do matrix multiplication by hand. There's no way to get around that. But we find fun ways to do it in teams, in groups to compete, who can solve the fastest. Just ways to keep students engaged in the process.
Talithia Williams thinks you should rigorously track your body's data. She and Steve Levitt trade birth stories and bemoan the state of STEM education.