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1. 

   Rats Used to Measure Danger from Penetrating Gamma Rays

   By Science NewsFebruary 28, 1931

2. 

   New Diesel Racer Will Run 1200 Miles without Refueling

   By Science NewsFebruary 28, 1931

3. 

   In Science Fields

   By Science NewsFebruary 28, 1931

4. 

   Electrically Heated Apartments for Toads and Snakes in Zoo

   By Science NewsFebruary 28, 1931

5. 

   Seeks Federal Aid for Crippled Children

   By Science NewsFebruary 28, 1931

6. 

   The Evening Skies in March

   By Science NewsFebruary 28, 1931

7. 

   “Grand-Scion” of Famous Elm to Replace Fallen Ancestor

   By Science NewsFebruary 28, 1931

8. 

   Mexican Villages Where None but Children See

   By Science NewsFebruary 28, 1931

9. 

   Nature Ramblings: A Contemporary Fossil

   By Science NewsFebruary 28, 1931

10. 

    New Clock Correct to 1-500 Second in 24 Hours

    By Science NewsFebruary 28, 1931

11. 

    First Glances at New Books

    By Science NewsFebruary 28, 1931

12. 

    Front Matter

    By Science NewsFebruary 21, 1931