Krista’s been in a conversation with Tiffany Shlain for several years about her practice of “Tech Shabbat.” For more than a decade, she and her family have taken a rest from screens sundown Friday to sundown Saturday; her book 24/6 is a kind of manual to open the practice to everyone. After a year in which many of us have relied on our devices as our portals to reality — our sole connection to the people and places we love — Krista called Tiffany to talk about how this practice works. Might it be a reset and ritual we could all use?