koya79 (Letter M) // iStock via Getty Images Plus; Justin Dodd (speech bubble) M is one of the earliest traceable letters in our entire alphabet. Its familiar up-and-down shape is thought to be ...

gorica (Letter O) // iStock via Getty Images Plus; Justin Dodd (speech bubble) An ob-and-soller, according to the Oxford English Dictionary, is “a person who engages in scholastic disputation ...

iOS: When you're trying to learn a new language (or any other skill), it's often better to study in small, frequent chunks. Drops limits your learning time to just 5 minutes of vocabulary building ...