Feature

Airplane Engine Production to Pass 25,000 by December

Layer of Lava on Moon Would Explain Cooling

Northern Lights Copied by Current through Nitrogen

Summer in the Sky

Cosmic Ray Particles Mostly Die on Trip to Earth

Cold Walls Get Dirty Faster than Warm Ones

Program for National Defense on Health Front Presented

Hitler’s Success Attributed to Personality Factors

Steel Welding Process Produces Fireworks

X-Ray Spray Gives Better Treatment for Leukemia

Erratum: In Science Fields: Salmon Taken for a Ride to Get Around a Dam

Front Matter