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Third, creationists ignore the evidence and deny that [X] exists altogether or assert that belief in a Young Earth is based on faith, not science. These ages weren't just made up — or, worse, accepted to "give evolution enough time".

Thorium's radioactivity was widely acknowledged during the first decades of the 20th century.In the second half of that century, thorium's uses have been diminished or annulled by concerns over its radioactivity and availability of non-radioactive replacements.Uses in which thorium was once widely used but is only marginally used now include uses as an alloying element in TIG welding electrodes, as a material in high-end optics and scientific instrumentation, and as the light source in gas mantles.This article collects evidences that place a lower limit on the age of the Universe beyond the 6,000 to 10,000 years asserted by most Young Earth creationists (YECs) and the literalist Ussher chronology.All of this evidence supports deep time: the idea, considered credible by scientists since the early 1800s, that the Earth (and the Universe) is millions These limits usually take the form: "Because we observe [X], which occurs at rate [Y], the universe must be at least [Z] years old".

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