About once a year, houses made from adobe should be given a layer of mud.

VOA: special.2009.01.12

That's what my fondest memory is,too, of the little Valentine's hearts that come out once a year, little nice kind of love little candies with sayings on them."

VOA: special.2010.02.08

And so,to the Germans of Pennsylvania, Saint Nicholas or Pelznickel was a man dressed in fur who came once a year with gifts for good children.Soon, people began to feel that the love and kindness Pelznickel brought should be part of a celebration honoring the Christkindl, as the Germans called the Christ child.

VOA: special.2009.12.20

You get bonus points if you do that at least once a year.

VOA: standard.2010.07.16

St.Louis has two science cafs. The second one - sponsored by Washington University - meets once a month during the academic year at a bar called the Schlafly Bottleworks.

VOA: standard.2010.05.04