And now she thinks she and her Harvard physics colleagues have found something new. What she is excited about is “dark matter,” which—along with “dark energy”—makes up the vast majority of the known universe. The current estimate is that 70 percent of the universe is dark energy and 26 percent dark matter. Which adds up to 96 percent. Meaning that what we see and know adds up to a measly 4 percent.
Four percent! The invisible 96 percent apparently keeps the universe in gravitational equilibrium, preventing it from collapsing on itself or dissipating into virtual nothingness. But we know almost nothing else about it. The problem has been that the dark stuff doesn’t seem to interact with the 4 percent we know in such a way that gives us a clue to its nature. But Randall believes she may have found a clue.
I ask her about human consciousness—the dark matter within us—namely whether she has thought about the mind/brain question: Is the mind the product of the brain, all our thoughts neurochemically determined (as the “materialists” say), or is the mind not a slave of the physical brain, somehow capable of free will (as the “dualists” believe)? Or can we never answer that question? The philosopher Colin McGinn calls himself a “Mysterian” as an homage to the ’60s one-hit wonder band (“96 Tears”) Question Mark & The Mysterians because he thinks our consciousness may never be capable of comprehending the mystery of its own nature.
Randall seems to take McGinn’s argument as a challenge: “First, I think it’s always a mistake to say ‘never,’ because we probably can understand a lot more about it even if we don’t ultimately understand it. Second, we haven’t been trying to answer this question for a very long time. We understand a lot of things now that we didn’t understand before. And it’s terrifically hard, because we don’t even know what we mean by consciousness.”
What Randall talks about when she talks about consciousness is a continuum.
“I do think one mistake we often make is we think of it as a binary thing, like we’re either conscious or not conscious. I think there’s a spectrum of consciousness and I think it’s interesting to study that—the difference between a plant and a dog, the difference between a dog and a baby, between a baby and a slightly older human… I think it’s sort of a continuum.” Looking at it that way, she says, “would be a good start.”
Read more: http://www.smithsonianmag.com/science-nature/Lisa-Randalls-Guide-to-the-Galaxy-208338141.html#ixzz2ZsLZ6xNP