This question is impossible to answer without more information, since almost every idea or theory or opinion has changed at one time or other. For example, the opinion about slavery used to be positive among presidents and prime ministers in the early 1800s; but I doubt that any leader today would think slavery is okay. Similarly, opinions have changed about whether to trust science or to rely on religion; and opinions are also different when it comes to interracial marriage, women's role in society, whether a country should have one official religion, whether a monarchy is better than a democracy, etc. In fact, most opinions are quite different today from what people believed 150 or 350 or 1000 years ago. If you can narrow down your question some more, I can better answer it.
No newspapers where published about what Haig did (bad) so it seemed like he was good at his job ;D
how the anemometer changed over time
The laws of physics have not changed over time. Our understanding of them has changed over time.
how has coal mining changed over time
People changed over time by growing up.
no they have changed over time. no they have changed over time.
how has neils bohr model changed over time
well it has changed over time bye people dancing it different styles.
how the seismograph change over time
his skills changed
how has deleware changed from 1776
one way that mcdonalds has changed over time is they now have bigger protion sizes