What was it like when the first elements formed?
<p>One of the most remarkable achievements in all of human history is the discovery of the scientific story of how our Universe began, evolved over time, and came to be the way it is today. Back in the very early stages of the Universe, we experienced conditions known as the hot Big Bang: where everything is extremely dense, energetic, and rapidly expanding. In these early stages, there were no bound states — no atoms, no atomic nuclei, not even protons and neutrons — just a free, hot plasma of particles and antiparticles. As the Universe expands, however, it cools, and numerous things ensue from that, including:</p>
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