Somechildrendisplayanunquenchable难以抑制的curiosityabouteverynewthingtheyencounter.
Insect pests are among the leading causes of crop failure.
HowmanypeopleareawarethatadancerwiththeNewYorkCityBallettypicallywearsoutaminimumoftwohundredpairsoftoeshoesperyear?
One of the greatest breakthroughs for professional women came in 1973 when the field of banking opened up for them.
The Salk vaccine is a major factor in the fight to eradicate polio.
In 1974 Henry Aaron broke Babe Ruth's monumental lifetime record of 714 home runs.