gets its name from the fact that all of the
plow's discs are set on the same axle at the same
vertical angle. This arrangement allows the
device to plow faster, handle heavy stubble well,
break hard sun-baked soil, and destroy weeds.
are members of the cucumber and squash family.
Grown on every continent except Australia and in
all fifty of the United States, they are believed
to have originated in Central America, with seeds
from related plants found in Mexico dating back
over 7000 years.