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Orbit demands about 7.8 km/s of sideways speed, the Moon is 384,000 km away, and Mars is at least 55 million km. Here is the physics of getting to space, the history of exploration, and where Artemis, Starship, and Mars stand as of October 2026.

Four major democracy indices, V-Dem, Freedom House, the EIU and International IDEA, have reported global decline for years, though the EIU's 2025 edition found scores stabilising. V-Dem counts 92 autocracies and 87 democracies at the end of 2025. What democracy requires, how the indices measure it, where they disagree, and how democracies erode.

About $9.6 trillion of foreign exchange changes hands on an average day. Banks create most money by lending, central banks set the price of credit, and the dollar sits on one side of almost every trade. Here is how the machinery fits together, and how it failed in 2008.

Vaccines taught the immune system to beat smallpox, polio, and measles, and a 2024 Lancet study estimated they averted 154 million deaths in 50 years. Yet hesitancy persists. Here is the immunology, the safety evidence, and the psychology behind refusal.

Luxembourg's GDP per capita was about $133,000 in 2023. The Democratic Republic of Congo's was about $660. Institutions, geography, colonial history, technology, and resources each explain part of that gap, and economists still argue about the weights.

What decides how fast a disease spreads, how many people it kills, and which defenses work? The epidemiology of pandemics, from reproduction numbers to vaccines, with the 1918 flu and COVID-19 as test cases.

What a share really is, how exchanges match buyers and sellers, how prices are set, what indices measure, why crashes happen, and how regulators keep the system running. Here's how stock markets actually work.

The bombs dropped on Hiroshima and Nagasaki fissioned less than a kilogram of material each. Modern warheads are larger, but not a thousand times larger. Here is the physics, the arms-control record, and the evidence for and against the explanations of why none has been used in war since.

By 2050, Japan, South Korea, Italy, and dozens of other countries will have more people over 65 than under 30. Shrinking workforces, swelling pension obligations, and collapsing birth rates are creating an economic slow-motion crisis. Here's what's actually happening and why it matters.

The US national debt passed $40 trillion in 2026. Whether that is a crisis or a manageable burden depends on interest rates, growth, and who holds the debt, and the answer is less obvious than either side claims.

Why does Russia keep fighting over access to the sea? Why does the United States have so much room to maneuver? Why has Poland been invaded from both sides? Geopolitics argues that mountains, rivers, coastlines, and resources shape political choices more than most people expect. Here is how the idea works, and where it breaks down.