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Prior to their extinction, Neanderthals had been widespread in Europe for 100,000 years. Then 50,000 years ago, modern humans moved into Europe from Africa. Twenty-six thousand years after that the last Neanderthal died. At one time it was thought that the Neanderthals were killed by climate change, but this theory has now been discounted. So why did the Neanderthals perish? Probably they were killed by the humans.
Background Radiation
The ambient ionizing radiation present in the environment, originating from natural and artificial sources.
Medical X-rays
A form of electromagnetic radiation used in healthcare to generate images of the inside of a body, aiding in diagnosis and treatment.
Isotopes
Variants of a particular chemical element which differ in neutron number, and consequently in nucleon number, but not in proton number.
Hydrogen
The lightest and most abundant element in the universe, consisting of one proton and typically one electron.
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