World population grew from 2.6 billion in 1950 to 7 billion in 2011. Nearly 600 million people still live in extreme poverty. UN promotes decolonization and supports democratic institutions
Uranium-235 is a fissile isotope making up 0.72% of natural uranium. Discovered in 1935 by Arthur Jeffrey Dempster. Has a half-life of 703.8 million years. Fission cross section is about 584.3 barns for slow neutrons
Nuclear binding energy is minimum energy needed to disassemble atomic nucleus. Binding energy is positive for stable nuclei, negative in theoretical physics. Mass of nucleus is less than sum of constituent nucleon masses. Einstein's E = mc² equation relates binding energy to mass difference
Most common uranium isotope with 99.284% natural abundance. Has half-life of 1.41×1017 seconds (4.468 billion years). Produces ~40% of Earth's radioactive heat. Can be fissioned by fast neutrons but not in thermal reactors
World population grew from 2.5 to 3.0 billion with 1 billion births. Television became common in American homes during Golden Age. Credit cards gained widespread popularity, especially Diners Club Card. Polio vaccine discovery led to rapid decline in disease incidence
Metric ton is a unit of measurement equal to 1,000 kilograms. Known as tonne in most other countries. Can be expressed as megagram (one million grams)