Health officials say these numbers usually increase during this time of year as more Americans cook and eat outdoors.

VOA: special.2011.06.17

Public theaters during this time were usually three floor levels high and were built around a stage area where the actors performed.

VOA: special.2010.01.06

But this was not the kind of thing young women growing up in the nineteen forties usually did.

VOA: special.2009.11.18

This powerful form of creative expression usually involves art made outside the limits and rules of official culture.

VOA: special.2010.04.14

Experts say the birds usually have flown to southern California or Mexico by this time of year.

VOA: special.2010.03.02

This area, from west Texas to southwest Minnesota, is where the most violent tornadoes usually happen.

VOA: special.2009.06.09

This nest is made up of thousands of pieces of bamboo tied together with the kind of brightly colored rope usually used by mountain climbers.

VOA: special.2010.08.13

This form of lupus usually goes away when the patient stops using the medicines.

VOA: special.2010.06.15

Usually,this requires near freezing temperatures, light winds and changing conditions in Earth's atmosphere.

VOA: special.2010.01.05

Usually,this requires near-freezing temperatures, light winds and changing conditions in Earth's atmosphere.

VOA: special.2011.01.11

This involved doing complex mathematics and usually took Eleanor several hours.

VOA: special.2009.12.23

This kind of clay usually contains many minerals.

VOA: special.2009.09.14

And this someone is usually related to the big family in power,".

VOA: standard.2009.08.29

This stretch of coastline southwest of Pago Pago was one of the hardest hit by the tsunami, when the usually peaceful ocean sent walls of water crashing into beachside homes.

VOA: standard.2009.10.07