Human brain is a wonder of nature and scientist wonder for centuries how it works. But another question is equally important: human brain is made up of 100 billion neurons and trillions of interconnections - what maintains all that in balance?
The Roman Empire had excellent engineers 2,000 years ago and a building material which survived until today - cement. Although it is use in the whole world, cement's basic molecular structure was not known until recent MIT research.
You are worth more with every new language you learn. But did you know that you actually don't learn words from other language but add them to your existing vocabulary? The two languages simply become one.