Dolphins sleep with one eye open.
Source : givingcompass
The term “OK” comes from the misspelling of the phrase “All Correct”.
Source : fullformhub
Spider webs were used as bandages in ancient times.
While you are sleeping, you can’t smell anything, doesn’t matter how disgusting or how pleasant the smell is.
Sea Lions have rhythm. They are the only animals, who are capable of clapping to a beat.