That's actually a myth as well. It's really played up in the American tales of Columbus. Most of science believed the earth was round, but it was in question since nobody had proven it to their satisfaction.
I do agree with your point (not too long ago, scientific consensus claimed blacks couldn't keep up with whites in the classrom).
Well, I'm just saying there are numerous areas that have been proven wrong. Science is never 100% accurate and anyone that says it is should be treated with great skepticism because they probably have an agenda. Science is constantly changing and there is plenty that we don't understand about the Earth, humans, animals, etc.
Phlogiston theory. Created to explain the processes of oxidation - corrosion and combustion - it was disproved by discovery of the fact that combustion is the reaction of fuel with oxygen and that corrosion is caused by oxidation of metals and the formation of compounds. Disproved by Antoine-Laurent Lavoisier
Geocentric theory of the solar system. Disproved by Nicolaus Copernicus and studies through astronomy, as well as the use of physics to predict occurrences that geocentrism could not. Whether Earth is really the centre of the universe remains to be seen, since we don't know exactly where the universe ends.
The classical elemental theory (that all substance is made of earth, air, fire and water). Disproved by the discovery of subatomic particles and the modern elements, as we know them today.
Newton's Laws of Motion (which were improved upon by Einstein - while not really proved wrong, the were shown to be not quite right either. For example in relativity or on the very small scale they don't hold).
Ether as a carrier of light waves and radio waves. Disproved by study of the dual particle-wave nature of light, which means it does not in fact require a medium of any kind, and the simple complete lack of any evidence for such a substance.(Disproved by the Michelson-Morley experiment.)
Aristotle's dynamic motion. It was an attempt at explaining momentum and why certain substances behave in certain ways; it was linked to the concept of the classical elements. Disproved by Galileo.