Tells you which sets to review today
Faded entries are later reviews — you only reach them by remembering the one before.
Reviews land at +1 +2 +3 +5 +8 +13 +21 +34 +55 +89 +144 +233 +377 days after the day you learned a set — the Fibonacci sequence, so the gaps widen as the set sticks. Dates are always counted from that first day, so a late review shortens the next gap rather than pushing everything back. Marking a set forgotten sends that set alone back to the start.