A tail call allows a function to return the result of another function without leaving an entry on the stack. Tail recursion is a specific case of tail calling. -- ASPN : Python Cookbook : Explicit Tail Call

Do not spoil what you have by desiring what you have not; but remember that what you now have was once among the things only hoped for. -- Greek philosopher Epicurus

The human brain starts working the moment you are born and never stops until you stand up to speak in public. -- Anonymous

Good work is no done by ‘humble’ men. -- H. Hardy, A mathematician's apology.

Vigorous writing is concise. A sentence should contain no unnecessary words, a paragraph no unnecessary sentences, for the same reason that a drawing should have no unnecessary lines and a machine no unnecessary parts. This requires not that the writer make all sentences short or avoid all detail and treat subjects only in outline, but that every word tell. -- William Strunk, Jr. (The Elements of Style)

A no uttered from the deepest conviction is better than a yes merely uttered to please or what is worse, to avoid trouble. -- Mahatma Gandhi

The only person you are destined to become is the person you decide to be. –Ralph Waldo Emerson

Only put off until tomorrow what you are willing to die having left undone. ~Pablo Picasso

I didn’t fail the test. I just found 100 ways to do it wrong. –Benjamin Franklin

Things work out best for those who make the best of how things work out. ~John Wooden