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Astronomer Wants New Check-up on Einstein

Ancient Plant Fossils Tell of Old Climates

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Sponges, Torn to Bits, Reassemble Themselves

Plant Lives in Air; Yet Has High Iron Content

Egg Supply Treatened by Invisible Raider

Says Infection May Lurk in “Harmless” Organisms

Use Iron to Ensnare Air Nitrogen

Extracts Strengthen Impoverished Blood

Mars May Support Life, New Observations Show

New Danish Tuberculosis Treatment to Be Tested by Government

Presidential Address at American Association Calls for Conservation