Feature

Nature Note

Hogs, Cows Getting ‘People’ Treatment

Plant Growth Hormone Induces Tree Maturation

Strong Root Systems Increase Grain Output

Abortions Sought Abroad

Czechs Impose Curbs on Cigarette Smoking

New Ideas and Gadgets

Doctors Are Reading

Front Matter

Earth Could Infect Mars

[Photograph]: Simulated Meteoroid

Sky Elevator Proposed to Link Space to Earth