Listen to these examples of inventions and ideas that some people said "couldn't be done" so they resisted the new.

1. The first successful cast-iron plow, invented in the United States in 1797, was rejected by New Jersey farmers under the theory that cast iron poisoned the land and stimulated the growth of weeds.

2. An eloquent authority in the United States declared that the introduction of the railroad would require the building of many insane asylums, since people would be driven mad with terror at the sight of locomotives rushing across the country.

3. In Germany it was proved by "experts" that if…