The conversation between human and AI assistant.
[|Human|] What is the half-life of Uranium-235?
[|AI|] The half-life of Uranium-235 is approximately 703,800,000 years (or around 704 million years). This means that after 704 million years, half of a sample of Uranium-235 will have decayed into other elements, mostly Thorium-231. The half-life is the time it takes for the quantity of a substance, in this case Uranium-235, to reduce to half its initial value.
[|Human|] 
What is the half-life of Uranium-235?