Feature

Mud-Dauber Wasp Pioneer among Masons

New Comet Discovered by Harvard Astronomer

Invisible Light Found to Pierce Thin Metal Films

Electric Charge of Positron Confirmed

400,000 Yards of Concrete in Feet of Boulder Dam

[Photograph]: Cock-Horse on Ancient Greek Vase

The Authors Say

Six Million Children without Enough to Eat

Light from Exploding Star May Solve Corona Riddle

New Books

Unpredicted Meteor Shower Surprises Astronomers

New Parachute Device Adopted by Navy