Significance half life radiometric dating techniques
Then there are negative truths, such as the null hypothesis in science, which asserts that particular associations do not exist unless proved otherwise.
For example, it is telling that among the tens of thousands of government e-mails, documents and files leaked in recent years, there is not one indication of a UFO cover-up or faked moon landing or allegation that 9/11 was an inside job by the Bush administration.
If such a behavior is even partly genetically determined, it will tend to become widespread in the population.
Then, even if circumstances change such that it no longer provides any survival or reproductive advantage, the behavior will still tend to be exhibited -- unless it becomes positively disadvantageous in the new environment.
Various radioactive elements are involved, including Carbon-14, Uranium-238, Thorium-232, and Potassium-40.
By the way, it is important to understand that most rock strata “dates” were actually assigned long before the first use of radioactive age estimating methods in 1911.
adaptive landscape: A graph of the average fitness of a population in relation to the frequencies of genotypes in it.
Peaks on the landscape correspond to genotypic frequencies at which the average fitness is high, valleys to genotypic frequencies at which the average fitness is low. adaptive logic: A behavior has adaptive logic if it tends to increase the number of offspring that an individual contributes to the next and following generations.
It is not impossible that the dinosaurs died a few thousand years ago (with the universe itself having been created 10,000 years ago), as Young Earth creationists believe, but it is so unlikely we need not waste our time considering it.
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co.
’ s first definition, a “skeptic” is “one who holds that there are no adequate grounds for certainty as to the truth of any proposition whatever.” This is too nihilistic.
There are many propositions for which we have adequate grounds for certainty as to their truth: There are 84 pages in this issue of . Dinosaurs went extinct around 65 million years ago.
True by verification and replication of radiometric dating techniques for volcanic eruptions above and below dinosaur fossils. True by a convergence of evidence from a wide range of phenomena, such as the cosmic microwave background, the abundance of light elements (such as hydrogen and helium), the distribution of galaxies, the large-scale structure of the cosmos, the redshift of most galaxies and the expansion of space.