In Switzerland, which unique calendar marks the countdown to Christmas by opening numbered doors each day?

Advent calendar

What fruit did Persephone eat that bound her to the Underworld for part of each year? Who was the prophet whose donkey refused to move, then spoke? What country won the very first Cricket World Cup in 1975? Who created the musical alter ego Ziggy Stardust? Who is the classical composer responsible for "The Planets" suite?