In Switzerland, what event involves costumed groups parading through towns ringing large cowbells around Christmas?

Trychle

What is the process called when water vapor turns into liquid water? Which African country is entirely surrounded by Senegal, except for coastline? Which chemical element has atomic number 8? Which treaty officially ended the Spanish-American War in 1898? Europa, Ganymede, and Io are moons of which celestial body?