Dinosaurs and Intelligence

Dinosaurs arose some 240 million years ago. They became the dominant terrestrial vertebrates after the Triassic–Jurassic extinction event 201 million years ago. Their ascendancy lasted another 135 million years until the Cretaceous mass extinction 66 million years ago opened the world to the eventual rise of mammals and us. The first mammal-like forms appeared some 225 million years ago. But for the next 160 million years, mammals had to find their niches in the shadow of the dinosaurs, characteristically living a nocturnal lifestyle, emerging from burrows to feed only at night. This may have favored the evolution of better eye-sight, smell, touch and hearing to be able to navigate, find food and survive in the dark. But they still had to hide from the dinosaurs.

The question of why dinosaurs never developed cognitive intelligence, despite the many millions of years they were the top vertebrate clade, forms a rich WWW vein. (Search for the question and check it out.) Some dinosaurs did get quite intelligent in the form of birds. Some avian dinosaurs are even tool users. But there is no evidence that dinosaurs ever achieved anything like the human intelligence which has allowed us to alter our environment in ways both planned and unplanned. We human beings (the last surviving species of the homo genus) have been around for only some 200 thousand years. If one starts counting with the Australopithecus, then our progenitors go back around 3.6 million years. In either case, the fact that dinosaurs didn’t develop intelligence and complex technology even over a hundred million years while we did in just a few raises at least two questions: Is the rise of intelligence inevitable and does it have survival value over the long run?

The second question may be easier to answer. Dinosaurs and all other life on earth have done pretty well without human-style intelligence. Indeed, intelligence has not played a major role over the four billion years of life on earth. Some dinosaurs may have been clever hunters, as are wolves for example, and Jurassic Park has shown us a possible example. But they apparently found the use of claw, teeth, armor and size sufficient to last until a huge asteroid took them out with most other life. This leads to an answer to the first question, was the rise of intelligence inevitable. We can never know what might have happened with the clever dinosaurs if they were given the next 65 million years instead of mammals. Large brains need extra oxygen and are costly in energy. Maybe there would never have been any evolutionary advantage to making the investment. Human intelligence may be a cosmic accident, the result of a particular rock hitting at a particular moment allowing the burrowing underclass – mammals – to take their furtive ways into the sunlight.

So to return to the question of the long-term survival value of our big brains, the dinosaurs did really well without them and it is not clear that they will save us from ourselves.

Why Time?

I've spent a good deal of time thinking about time.  It is a mystery.  We know it passes, the more quickly it seems as we get older.  Since Einstein, we know it is part of spacetime, baked into the fabric of the universe.  But that simply deepens the mysteries.  Why can we travel in all directions in space but only one in time?  And how can it be that there is no absolute time the same everywhere?  The "now" that  I see all around me is punctured during the day by photons from the sun that show me how that looked nine minutes ago and at night by stars showing me how they existed many thousands of years ago?  When we see those stars, we are looking into the past. Our experience of the "now" of those stars is likewise thousand of years in our future.

 

So time varies by distance in space.  The speed of light -- 186,000 miles per second -- connects these.  Contemplation of the speed of light leads to pondering how light can possibly have a speed.  Objects with mass, when not at rest, have speed.  (Actually, nothing is ever at rest except relatively.)  As an object with mass increases speed, time runs slower as it appears to observers not so moving.  Relative motion, in effect, eats relative time; the quicker something moves, the less time remains that seems to pass for the object moving relative to the observer at rest where "normal" time passes.  Mass-less particles, such as photons, do not experience time.  Mass-less particles are everywhere they will ever be at the same moment and are, in this sense, eternal.  Only objects with mass -- including us -- experience light as traveling in time.  A photon that left Proxima Centauri, traveled 4.25 years and just reached our eyes here on earth, took that photon no time at all. 

 

By capturing some of the particles spewing from the Big Bang and giving them mass, the Higgs Boson may in effect have also created time.  But as there is no universal and simultaneous "now," how can we think about time. As noted, under Einsteinian relativity, time is the fourth dimension and relative to location and motion in the other three.  Yet clearly there is also "now."  We live in it.  Is there not a single "now" that exists for all the photons that fill the universe in their one timeless, eternal moment?  Does that create a universal framework of now?  Perhaps each and every particle of matter exists in its own "now" tied to every other such moment within the crystalline universal now established by light?  Light seems to have a speed because it ties together the universe of separate, individual "nows."   Perhaps mass is simply the way everything is kept from happening at once?  Mass separates us from eternity, immersing us in spacetime where our consciousness has space and time to manifest.  Perhaps time exists to provide a way for the universe to experience itself.