For you coffee to finish brewing! If you use an automatic drip coffee machine, you might be tempted to put your mug directly under the freshly brewed stream to grab a cup before the pot is actually full—a life hack, it would seem! But it turns out your coffee will be better if you wait.
The reason that you shouldn’t try to grab a cup while your coffee is still brewing is that the coffee concentration changes as the brew progresses. That is, it starts very strong but gradually becomes weak.
Click here to read more: http://lifehacker.com/why-you-should-wait-until-your-coffee-is-finished-brewi-1788585762?