Deoxygenated blood is blue
The myth that blood only turns red when it is exposed to oxygen stems from the fact that blood looks blue in our veins. This is just a trick of the eyes, though. Light is refracted through the layers of our skin, which then reflects back to our eyes and gives blood a bluish look. However, blood is definitely red.
Diamonds are made from coal
It’s cool to think that something as beautiful as a diamond would come from coal, but diamonds are actually formed in vertical shafts full of rocks formed by volcanoes. The correlation doesn’t make sense, anyway: Coal is found on the surface of the Earth while diamonds are found in the Earth’s mantle and eventually carried up by volcanic eruptions.
Witches were burned at the stake during the Salem Witch Trials
The Salem Witch Trials in 1692 and 1693 were certainly an infamously morbid time, but none of the accused “witches” were ever burned at the stake, as commonly believed. The majority of the convicted people were either imprisoned or hanged at the gallows.