Some people may say that Lincoln was a terrible president due to his terrible public speaking abilities and his supposedly "drug use". Personally, I think that everyone has their flaws but Lincoln did as much as he could to help our country. Lincoln freed a lot of slaves by abolishing slavery. If it wasn't for Lincoln, slavery could still be a thing today. Again personally, I would say Lincoln was a good president but had his bad moments just like any other normal human being.
The main constraints on the pursuit of knowledge are ethical constraints on what may be done to acquire knowledge, particularly if others may be harmed in the process.
