Articles from Science News (April 8, 1989)

Title	Author	Type	Words
A balloonful of Earth to help study Mars.			632
Breast cancer risk linked to dense tissue.	Fackelmann, Kathy A.		504
Calls in the wild.			290
Carbon ratio shows Halley may be alien.	Flam, Faye		429
Clot-buster's cost-effectiveness questioned.	Weiss, Rick		378
Dinosaur tragedy yields birth clues.			243
Fantastic fortnight of active region 5395.	Eberhart, Jonathan		525
Fusion claims multiply, strengthen.	Amato, Ivan		821
Looking for Mr. Greenhouse: can scientists say whether humans have changed the climate through the greenhouse effect?	Monastersky, Richard		2172
Methane key to Arctic mystery mounds.			577
Mixing it up in space: astronomers debate the role mergers play in galaxy formation.	Hartley, Karen		1426
Nicotine boosts a busy body's metabolism.	Weiss, Rick		357
Pollen provides ancient weather report.			436
Proton puzzle puts physicists in a whirl.	Peterson, Ivars		676
Tasmania's earliest settlers.			274
What killed the chickens?			315
Wherefore the world's wobble?			536