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LEO CHALUPA
Ophthalmologist and Neurobiologist, University of California, Davis

A 24-hour period of absolute solitude
Our brains are constantly subjected to the demands of multi-tasking and a seemingly endless cacophony of information from diverse sources. Cell phones, emails, computers, and cable television are omnipresent, not to mention such archaic venues as books, newspapers and magazines.

This induces an unrelenting barrage of neuronal activity that in turn produces long-lasting structural modification in virtually all compartments of the nervous system. A fledging industry touts the virtues of exercising your brain for self-improvement. Programs are offered for how to make virtually any region of your neocortex a more efficient processor. Parents are urged to begin such regimes in preschool children and adults are told to take advantage of their brain’s plastic properties for professional advancement. The evidence documenting the veracity for such claims is still outstanding, but one thing is clear. Even if brain exercise does work, the subsequent waves of neuronal activities stemming from simply living a modern lifestyle are likely to eradicate the presumed hard-earned benefits of brain exercise.

My dangerous idea is that what’s needed to attain optimal brain performance — with or without prior brain exercise — is a 24-hour period of absolute solitude. By absolute solitude I mean no verbal interactions of any kind (written or spoken, live or recorded) with another human being. I would venture that a significantly higher proportion of people reading these words have tried skydiving than experienced one day of absolute solitude.

What to do to fill the waking hours? That’s a question that each person would need to answer for him/herself. Unless you’ve spent time in a monastery or in solitary confinement it’s unlikely that you’ve had to deal with this issue. The only activity not proscribed is thinking. Imagine if everyone in this country had the opportunity to do nothing but engage in uninterrupted thought for one full day a year!

A national day of absolute solitude would do more to improve the brains of all Americans than any other one-day program. (I leave it to the lawmakers to figure out a plan for implementing this proposal.)The danger stems from the fact that a 24 period for uninterrupted thinking could cause irrevocable upheavals in much of what our society currently holds sacred.But whether that would improve our present state of affairs cannot be guaranteed.

There are no souls
I am not concerned here with the radical claim that personal identity, free will, and consciousness do not exist. Regardless of its merit, this position is so intuitively outlandish that nobody but a philosopher could take it seriously, and so it is unlikely to have any real-world implications, dangerous or otherwise.

Instead I am interested in the milder position that mental life has a purely material basis. The dangerous idea, then, is that Cartesian dualism is false. If what you mean by “soul” is something immaterial and immortal, something that exists independently of the brain, then souls do not exist. This is old hat for most psychologists and philosophers, the stuff of introductory lectures. But the rejection of the immaterial soul is unintuitive, unpopular, and, for some people, downright repulsive.

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OLIVER MORTON
Chief News and Features Editor at Nature; Author, Mapping Mars

Our planet is not in peril
The truth of this idea is pretty obvious. Environmental crises are a fundamental part of the history of the earth: there have been sudden and dramatic temperature excursions, severe glaciations, vast asteroid and comet impacts. Yet the earth is still here, unscathed.

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JAMSHED BHARUCHA
Professor of Psychology, Provost, Senior Vice President, Tufts University
The more we discover about cognition and the brain, the more we will realize that education as we know it does not accomplish what we believe it does

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STEPHEN M. KOSSLYN
Psychologist, Harvard University; Author, Wet Mind
A Science of the Divine?
Here’s an idea that many academics may find unsettling and dangerous: God exists. And here’s another idea that many religious people may find unsettling and dangerous: God is not supernatural, but rather part of the natural order. Simply stating these ideas in the same breath invites them to scrape against each other, and sparks begin to fly. To avoid such conflict, Stephen Jay Gould famously argued that we should separate religion and science, treating them as distinct “magisteria.” But science leads many of us to try to understand all that we encounter with a single, grand and glorious overarching framework. In this spirit, let me try to suggest one way in which the idea of a “supreme being” can fit into a scientific worldview.

I offer the following not to advocate the ideas, but rather simply to illustrate one (certainly not the only) way that the concept of God can be approached scientifically.