The expanding Earth was a hypothesis, taken seriously by some scientists into the twentieth century, which claimed that the planet is steadily growing larger, and that this growth pushed the continents apart. It has…
Plate tectonics is the scientific theory that Earth's outer shell is broken into a set of large, rigid plates that drift slowly over the hotter, weaker mantle beneath them. It is the organizing framework of modern…
The Manhattan Project was a secret American research effort during World War II that produced the first atomic bombs. A vast scientific and industrial undertaking, it ushered in the nuclear age and changed warfare and…
The cosmic microwave background is a faint glow of microwave radiation that fills all of space, the leftover heat from the early universe. Its discovery was the decisive evidence for the Big Bang and is one of the most…
Ball lightning is a reported phenomenon in which a glowing, floating sphere of light appears, usually during thunderstorms. Many people claim to have seen it, but what it is, and even whether it is a single real…
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From the Big Bang to you13.8 billion years on one board: nine chapters, over fifty capsules, and the questions still open at every step. Follow the threads from the first instant to the first cities.54 capsulesby Emmanuel Okwu