"Speak" or "talk"?

So speak tends to be used for one-sided communications (e.g. she spoke to her employees), whereas talk implies a conversation or discussion between two or more people (e.g. everyone was talking when he walked into the room). Speak is a little more formal than talk, and is often used in polite requests.

For example, eg. May I speak to the manager?

Réserve cognitive

Savez-vous que d'apprendre une langue étrangère est très bien pour la réserve cognitive?

"Customer" or "client"?

J'aimerais regarder la différence entre "customer" et "client".....

Proverbe

Que veut dire :  "It is not over until the fat lady sings" ?