Students in grades six through 12 can compete for a $100 gift certificate from Edmund Scientifics®. The winner will be determined by a random drawing from entries with all the correct answers.

1. By what percentage did DDT reduce malaria cases between 1930 and 1950?

A. 70 percent.
B. 65 percent.
C. 50 percent.
D. 35 percent.

2. Which university receives the largest amount of federal research grants for science and engineering?

A. University of Michigan.
B. Cornell University.
C. Johns Hopkins University.
D. Michigan Technological University.

3. What percentage of U.S. electricity is supplied by nuclear power?

A. 10 percent.
B. 20 percent.
C. 25 percent.
D. 32 percent.

4. What percentage of the energy generated by combustion is lost as heat in an internal combustion engine?

A. One-quarter.
B. One-third.
C. One-half.
D. Two-thirds.

5. What does the acronym CVT stand for?

A. Compressed V8 Timing.
B. Continuously Variable Transmission.
C. Computerized Valve Technology.
D. Consistency Variant Tires.

6. What is the name of the scientist who developed the Red Queen Hypothesis?

A. Charles Dodgson.
B. Louis Leakey.
C. Carroll Lewis.
D. Leigh Van Valen.

7. How many light sockets are in the average American household?

A. 25.
B. 35.
C. 45.
D. 50.

8. What percentage of domestic energy is used for lighting?

A. 5 percent.
B. 10 percent.
C. 12 percent.
D. 22 percent.

9. What percentage of energy used by an incandescent bulb is converted to light?

A. 75 percent.
B. 50 percent.
C. 10 percent.
D. 5 percent.

10. How much mercury is contained in an average fluorescent bulb?

A. 5 milligrams.
B. 10 milligrams.
C. 25 milligrams.
D. 35 milligrams.