13.4 billion years is 3 times of the half-life, 4.47 billion years. So the Uranium-238 will go through three times of half decay. So the remain percentage will be 50%*50%*50%=12.5%.
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It increases availability of food for humans
C.Pennsylvania Titusville is in the state of Pennsylvania
Insulation wraps because independent is the variable you are changing to affect the dependent variable (what you are measuring)
