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Briefly, a radioactive isotope is a kind of atom which decays into a different kind of atom: for example. one called uranium-238 turns into one called lead-206. Because we know how long this takes to happen, we can think of the isotope as a radioactive clock. Radioactive clocks are rather like the water clocks and…
The gradual advance of Geology, during the last twenty years, to the dignity of a science, has arisen from the laborious and extensive collection of facts, and from the enlightened spirit in which the inductions founded on those facts have been deduced and discussed. To those who are unacquainted with this science, or…
When Lucy’s hundreds of fragments were assembled, she turned out to be a female of a new species, Australopithecus afarensis, dating back 3.2 million years. She was between 20 and 30 years old, 3.5feet tall, weighing a scant 60 pounds, and possibly afflicted with arthritis. But most important, she walked on two legs…
Though the theories of plate tectonics now provide us with a modus operandi, they still seem to me to be a periodic phenomenon. Nothing is world-wide, but everything is episodic. In other words, the history of anyone part of the earth, like the life of a soldier, consists of long periods of boredom and short periods…
The world is the geologist's great puzzle-box; he stands before it like the child to whom the separate pieces of his puzzle remain a mystery till he detects their relation and sees where they fit, and then his fragments grow at once into a connected picture beneath his hand.
“What will happen? When we leave the world of the dead, will we live again? Or will we vanish as our daemons did? Brothers, sisters, we shouldn’t follow this child anywhere till we know what’s going to happen to us!” Others took up the question: “Yes, tell us where we’re going! Tell us what to expect! We won’t go…
Crying is the earliest and most compelling of infant signals," writes Ronald Barr, and surely there is no sound on earth more piercing than the cry of an infant. The ability to cry was hard-wired into human babies long ago as a potent signal to get adult attention. Like other primates, human infants needed to be able…
One cannot foretell the surprises or disappointments the future has in store. Before this chapter of the World State can begin fairly in our histories, other chapters as yet unsuspected may still need to be written, as long and as full of conflict as our account of the growth and rivalries of the Great Powers. There…
Behold the mighty dinosaur, Famous in prehistoric lore, Not only for his power and strength But for his intellectual length. You will observe by these remains The creature had two sets of brains - One in his head (the usual place), The other at his spinal base, Thus he could reason A priori As well as A posteriori. No…
The Destruction of the Temple and Signs of the End Times 5 Some of his disciples were remarking about how the temple was adorned with beautiful stones and with gifts dedicated to God. But Jesus said, 6 “As for what you see here, the time will come when not one stone will be left on another; every one of them will be…
Explosions are seldom one hundred per cent efficient. When a star ends as a supernova, the nuclear explosive material, which includes uranium and plutonium together with large amounts of iron and other burnt-out elements, is distributed around and scattered in space just as is the dust cloud from a hydrogen bomb test…
First, if you want to see clues about our future, step away from your computer screen. Go outside and stand near a four-way intersection that’s regulated only by stop signs. Watch for a while as drivers take turns, not-quite-stopping while they gauge each others’ intentions, negotiating rapid deals with nods and…