The Green Revolution took place during the 1950s and 1960s and is one of the primary causes behind the rapid growth in population seen around the world since the end of the Second World War. The Green Revolution involved wholesale changes and technological innovations in the area of agriculture that have allowed farms to be far more productive and efficient than they were previously. The Green Revolution, by some estimates, is credited with allowing an additional one to two billion people to survive on Earth.

The Green Revolution took place during the 1950s and 1960s and is one of the primary causes behind the rapid growth in population seen around the world since the end of the Second World War. The Green Revolution involved wholesale changes and technological innovations in the area of agriculture that have allowed farms to be far more productive and efficient than they were previously. The Green Revolution, by some estimates, is credited with allowing an additional one to two billion people to survive on Earth.

The Nuclear Non-Proliferation Treaty was signed in 1968 by most of the nations of the world. At the time of signing, the known nuclear powers were Russia, the United States, China, the United Kingdom, and France. Since then, India, Pakistan, North Korea, and (likely) Israel have acquired nuclear weapons. None of those four countries are part of the Nuclear Non-Proliferation Treaty. The aim of the Nuclear Non-Proliferation Treaty was to prevent new nations from acquiring nuclear weapons and to encourage those states that already had nuclear weapons to disarm.

The Nuclear Non-Proliferation Treaty was signed in 1968 by most of the nations of the world. At the time of signing, the known nuclear powers were Russia, the United States, China, the United Kingdom, and France. Since then, India, Pakistan, North Korea, and (likely) Israel have acquired nuclear weapons. None of those four countries are part of the Nuclear Non-Proliferation Treaty. The aim of the Nuclear Non-Proliferation Treaty was to prevent new nations from acquiring nuclear weapons and to encourage those states that already had nuclear weapons to disarm.

The Archduke of Austria-Hungary, Franz Ferdinand, was assassinated in June of 1914 by Gavrilo Princip. After his assassination the Austrian Empire implicated much of the Serbian high command and used the incident as a pretext to invade Serbia. This action disturbed the entangled alliances of Europe and lead directly to the outbreak of World War I a few months later.

The Archduke of Austria-Hungary, Franz Ferdinand, was assassinated in June of 1914 by Gavrilo Princip. After his assassination the Austrian Empire implicated much of the Serbian high command and used the incident as a pretext to invade Serbia. This action disturbed the entangled alliances of Europe and lead directly to the outbreak of World War I a few months later.

"Lebensraum" means living space. It was Hitler's belief that the German people needed more territory to grow and to prosper, and he felt that as much of Central Europe was settled by German-speaking people, he had a "legitimacy" to expand aggressively into neighboring states. The policy of "Lebensraum" led to the annexation of the Sudetenland and much of Central Europe.

"Lebensraum" means living space. It was Hitler's belief that the German people needed more territory to grow and to prosper, and he felt that as much of Central Europe was settled by German-speaking people, he had a "legitimacy" to expand aggressively into neighboring states. The policy of "Lebensraum" led to the annexation of the Sudetenland and much of Central Europe.

In the years leading up to World War One, the world witnessed great advances in technology that could be used to defend and fortify positions (most notably the machine gun), but far fewer advances in technology that aided mobility and attacking. In such a situation as existed on the Western front of Europe during World War One, the advantage was firmly in the hands of those in a defensive position. This lead to a massive stalemate in which the Allied and Central powers faced off across a few miles of unmanned terrain (“No Man’s Land”), and traded suicidal attacks over the top.

Penicillin was invented by Alexander Fleming in 1928. The story goes that Fleming was experimenting with bacterial molds when he went away on vacation; upon returning, he discovered that one of his bacterial cultures was contaminated with a fungus and that the cultures surrounding it had been destroyed. So, completely by accident, Fleming discovered one of the most important medicines in human history—the antibacterial penicillin.