And still only use 10% brainpower.

Snopes Urban Legends says no.

Claim: We use only ten percent of our brains.
Status: False.
Origins: Someone has taken most of your brain away and you probably didn't even know it. Well, not taken your brain away, exactly, but decided that you don't use it. It's the old myth heard time and again about how people use only ten percent of their brains. While for the people who repeat that myth, it's probably true, the rest of us happily use all of our brains.
The Myth and the Media
That tired Ten-Percent claim pops up all the time. ...

read more»

And still only use 10% brainpower.

Snopes Urban Legends says no.

Claim: We use only ten percent of our brains.
Status: False.
Origins: Someone has taken most of your brain away and you probably didn't even know it. Well, not taken your brain away, exactly, but decided that you don't use it. It's the old myth heard time and again about how people use only ten percent of their brains. While for the people who repeat that myth, it's probably true, the rest of us happily use all of our brains.
The Myth and the Media
That tired Ten-Percent claim pops up all the time. In 1998, national magazine ads for U.S. Satellite Broadcasting showed a drawing of a brain. Under it was the caption, "You only use 11 percent of its potential." Well, they're a little closer than the ten-percent figure, but still off by about 89 percent. In July 1998, ABC television ran promotional spots for The Secret Lives of Men, one of their offerings for the fall season's lineup. The spot featured a full-screen blurb that read, "Men only use ten percent of their brains."

One reason this myth has endured is that it has been adopted by psychics and other paranormal pushers to explain psychic powers. On more than one occasion I've heard psychics tell their audiences, "We only use ten
percent of our minds. If scientists don't know what we do with the other ninety percent, it must be used for psychic powers!"

There's more on that particular page link to the Snopes site.

Here's a blogger who tackles the meaning of life.

I would argue that a far more meaningful response (pardon the pun) is to point out how worthless a life is if it is spent hooked up to a lie. To spend a person’s one and only life hooked up to a lie, without getting a chance to do anything real, truly is a wasted life. Indeed, it is about the only way that a life can truly be wasted.

Of course, it is possible for a theist to still find value in things that are real. However, it is possible to find value in real things as well. So, between these two people, there is not much of a difference in their capacity to have a meaningful life. Those who have tru...

Here's a blogger who tackles the meaning of life.

I would argue that a far more meaningful response (pardon the pun) is to point out how worthless a life is if it is spent hooked up to a lie. To spend a person’s one and only life hooked up to a lie, without getting a chance to do anything real, truly is a wasted life. Indeed, it is about the only way that a life can truly be wasted.

Of course, it is possible for a theist to still find value in things that are real. However, it is possible to find value in real things as well. So, between these two people, there is not much of a difference in their capacity to have a meaningful life. Those who have truly wasted the one and only life they will ever have are those who spent that life dedicated to a lie and, in particular, a lie that causes harm to others.

Unless you are talking about something real, it does not even make sense to start talking about something being meaningful.

I would also recommend reading The Cosmic Perspective by Neil deGrasse Tyson

Very good, laceym.

I might add the unknown is a beautiful challenge, not a frightening one. The idea isn't to take something on faith but to deal with it in terms of how closely it captures what we presently know as we reach toward understanding something which we don't.

"Smart people believe weird things because they are better at rationalizing beliefs that they arrived at for nonsmart reasons. That is, most of us believe what we do for a host of psychological and social reasons that have nothing to do with reason and evidence. However, because we live in the age of science and reason, we have been trained to justify our beliefs with evidence and logic. Some beliefs are simply not ...

Very good, laceym.

I might add the unknown is a beautiful challenge, not a frightening one. The idea isn't to take something on faith but to deal with it in terms of how closely it captures what we presently know as we reach toward understanding something which we don't.

"Smart people believe weird things because they are better at rationalizing beliefs that they arrived at for nonsmart reasons. That is, most of us believe what we do for a host of psychological and social reasons that have nothing to do with reason and evidence. However, because we live in the age of science and reason, we have been trained to justify our beliefs with evidence and logic. Some beliefs are simply not subject to rational and empirical defense, however, and religious beliefs fall into this category. In my opinion, if one examines one's personal religious beliefs very deeply one is faced with an uncomfortable choice: (1) abandon those beliefs or (2) bury them in a logic-tight compartment isolated and protected from such rational and scientistic analysis. Or, just don't think about it too much." -- Michael Shermer