Gambians are voting for their president with a unique marble system.
Voters enter a booth and pop a clear glass marble into one of three drums representing the candidates, instead of a putting a ballot paper into a box.
As the marble falls into the drum, it hits a bell so officials can tell if anyone votes more than once.
pse·phol·o·gy (sē-fŏl'ə-jē) n.
The study of political elections.
[Greek psēphos, pebble, ballot (from the ancient Greeks' use of pebbles for voting)]