1. Since the 1950’s, folk’ music has had a significant influence on many popular vocal and instrumental music.

2. Each year millions of tons of fertile topsoil that could produce good crops washed away by rains.

3. The Everglades, a large swamp area is an unique wilderness extending over much of southern Florida.

4. Fluorine, a greenish-yellow gas that is slightly heavy than air is poisonous and corrosive and has a penetrating and disagreeable odor.

5. Hummingbirds are the only birds that can fly to backwards .

6. A bar code consists a pattern of lines and bars that a computer can translate into information .

7. Murres are black-and-white driving birds that mate every five or six years and lay only a single egg at time .

8. Instead of tooth , the blue whale has a row of bony plates in its mouth that functions as a food-collecting device.

9. Naturalists have identified at least four hundred of species of mammals and six hundred types of birds in the state of California.

10. In some areas of the United States, unfavorable climate or soil make farming an impossible task.

11. Much of the significant research related for the theory of numbers concerns the distribution of prime numbers.

12. Each major styles of architecture emerged because new problems in building or challenges in design appeared for architects to resolve .

13. The Canadian province of British columbia is rich of minerals and, because over 50 percent of the land is covered with forests, lumbering is its major industry.

14. Orchestrating musical works requires a understanding of the range and characteristics of each instrument.

15. Slow growth in the early 1900’s, linked with rising unemployment, less spend , and meager business investments, led many experts to declare a recession.

16. The superintendent of women nurse for the Union Army during the Civil War was Dorothea Dix .

17. The modern detective story, in which a detective solves a crime by discovering and interpretation evidence, is considered to have originated with Edgar Allan Poe’s “ The Murders in the Rue Morgue” in 1841.

18. Gemstones are usually bright, color , opaque or transparent minerals found in the rocks of the Earth .

19. The Wright Brothers were owner of a bicycle shop, and they used a number of bicycle parts to make the original motorized airplane.

20. Absolutely nothing that floats , neither a corked bottle nor a 50,000-ton ships , can escape the effects of water currents.

21. The chippewa and Santee Sioux of the Upper Mississippi River regional have used catlinite to produce carvings for almost 150 years .

22. Newborn infants show a distinct preference for human voices over other sounds and also prefer her own mothers’ voices to the voices of strangers.

23. Hypoglycemia is a condition in which a rapidly drop in blood sugar most often results from an oversecretion of insulin from pancreas.

24. Today’s farmers have increased milk production greatly through improved methods of breeding, feeding, and manage dairy cattle.

25. Gold or silver bullions serve into commerce as mediums of exchange all over the world .