1943 to 1945, the Allied oil campaign • In 2025-26 Ukraine has applied the same logic to Russia, opening a deep-strike front far behind the lines with long-range drones and missiles aimed at refineries, oil depots and pipelines. By 2026 one industry estimate put roughly a third of Russia's oil-refining capacity offline; Russia banned fuel exports (from April) and domestic stations began rationing; and on 21 June 2026 Russian-occupied Crimea suspended civilian gasoline sales altogether (drivers had already been held to 20 litres a week on coupons), the worst fuel crisis there since the 2014 annexation, after strikes the Kremlin-appointed head said killed four and wounded 28. As one analysis put it, long-range strikes are cutting how much fuel Russia can produce while shorter-range strikes are cutting its ability to move what it still makes. But the parallel is honest about its limits: Germany was uniquely fragile, a fuel-poor nation running on a few bombable synthetic plants, whereas Russia is one of the world's largest oil and gas producers with vast reserves and refining capacity spread across eleven time zones. Ukraine's campaign inflicts serious shortages and economic damage, a steady tax on the war, but it cannot ground a petro-superpower the way the Allies grounded the Wehrmacht.

1901 to 1906, and the century since • In June 2026 a team at Monash University reported in ACS Chemical Neuroscience that the copper compound Cu(ATSM) takes a different approach from the failed drugs: rather than blocking amyloid production, it repairs the weakened P-glycoprotein pump at the blood-brain barrier, restoring the brain's own ability to clear amyloid. In mice bred to develop Alzheimer's, it reduced toxic amyloid-beta by about 42 percent and improved spatial learning by about 44 percent over roughly eight weeks, and may also activate microglia to degrade plaques. Two features make it notable: Cu(ATSM) has already passed human safety trials for Parkinson's disease and ALS (a potential fast track), and the strategy of restoring clearance is closer to the actual failure Alzheimer saw than a century of attempts to block production. The crucial caveat is that this is preclinical, in mice, and the history of Alzheimer's research is full of compounds that dazzled in mice and failed in humans, so it is a genuinely new mechanism and a reason for measured hope, not a cure.

1867 to 1946, the United States and Denmark • In 2026 the US president revived the demand to acquire Greenland openly, calling for immediate negotiations, declining to rule out economic pressure (while disavowing force), and framing it as keeping Russia and China out of a strategically vital, warming Arctic of new shipping lanes and minerals. Denmark and Greenland have called their sovereignty a 'red line', allies are alarmed, and the demand for one NATO member to absorb another's territory has strained the alliance. The strategic logic is unchanged across 160 years: the US covets Greenland not for itself, just as it wanted the Danish West Indies not for their sugar, but for position and above all to deny it to a rival (Germany in 1917; the Soviet Union in 1946; Russia and China in 2026). The one real difference is agency: in 1917 a great power could pressure a small neutral into selling an inhabited colony over the heads of its people, who were simply told which flag they lived under, whereas in 2026 Greenland has its own elected government and is using its voice to refuse.

1687 to the present • In June 2026 a team of physicists in Dresden working with the theorist Roderich Moessner published in Nature Physics a method for handling non-reciprocal interactions efficiently, by introducing carefully designed 'imaginary partners', phantom agents that restore a hidden symmetry in the equations, allowing flocks, crowds and living tissues to be simulated with unprecedented accuracy. The work belongs to the fast-growing physics of 'active matter', the study of systems whose components convert energy into their own motion, which spans the swarming of cells in a healing wound or a growing tumour, the dynamics of panicked crowds, the schooling of fish, and the design of swarms of small robots. The deeper point is that Newton's third law was never wrong, it simply has a domain: it reigns over passive matter that only reacts, and quietly bends at the threshold of matter that drives itself, marking the border beyond which the physics of living things begins.

1804 to 1947, Haiti and France • In mid-June 2026 UN Secretary-General Antonio Guterres visited a Haiti in near-total collapse: the armed coalition Viv Ansanm controlled roughly 70 percent of the capital, Port-au-Prince; about 2,300 people had been killed across the country in 2026 and some 1.5 million displaced (more than one Haitian in ten); and Haiti had had no president since Jovenel Moise's assassination in 2021, with a new internationally backed gang-suppression force only now preparing to deploy. It is tempting to read Haiti's collapse as simple state failure, but a country has no deep institutions, infrastructure or reservoir of public wealth to resist such a collapse partly because, for the first 122 years of its life as a free nation, it was financially bled, by treaty and at gunpoint, as the price of being allowed to exist. The double debt was not the only wound (a US occupation, dictatorships, coups and earthquakes followed) but it was the foundational one: Haiti began its independence already a century behind, paying for its own freedom rather than building on it.

1912 to 1991 • The decades-old mystery is sharper than ever in 2026. New analysis is trying to trace the Amaterasu particle's path to a nearby starburst galaxy after all, arguing the apparently empty source region is an artifact of incomplete maps, while other physicists argue these record-breakers may be ultra-heavy atomic nuclei rather than lone protons, which would rewrite the calculation of where they can come from and how they survive the journey; next-generation observatories are being designed to settle the question. Beneath the competing theories lies a staggering fact: somewhere in the universe there is a natural particle accelerator that dwarfs everything humanity has built by a factor of tens of millions, it is operating right now, and we cannot say with confidence what it is or even where it is.

1966 to 1975, Gaullist France • On 3 June 2026 the European Commission presented a European Technological Sovereignty Package, including a Chips Act 2.0, a Cloud and AI Development Act, an EU Open Source Strategy, and, for the first time, a formal EU definition of 'digital sovereignty'; France and Germany had launched a joint digital-sovereignty task force after a November 2025 summit. The driving fact is that the European Union depends on non-EU suppliers, overwhelmingly American and increasingly Chinese, for more than 80 percent of its key digital products, services and infrastructure. The argument is precisely de Gaulle's, scaled to a continent: a power that does not control its own chips, cloud, software and AI can be throttled or refused by whoever does, exactly as Washington once refused de Gaulle his supercomputer. And the difficulty is precisely his too, as the Plan Calcul warned: building a champion by decree against entrenched incumbents is a fight money and patriotism do not easily win, and the would-be escapee tends to end up partnered with the very power it meant to escape.

1938 onward • In June 2026 a research team reported in the journal Environmental Science & Technology the first credible route to destroying PFAS without exotic additives. They found that hydrogen radicals, extraordinarily reactive fragments generated from ordinary water by intense ultraviolet light (most effective below 300 nanometres), attack PFAS molecules and strip their fluorine atoms one by one, breaking the supposedly unbreakable chains into smaller, less persistent compounds. The finding overturns earlier assumptions about which reactive species drive PFAS breakdown, though the process is still slow and can leave intermediate byproducts, so it is not yet a complete solution. The deeper point is that the very property humanity celebrated in Teflon, its near-perfect stability, is the same property that turned its chemical family into permanent pollution inside our own bodies: the miracle and the curse were one property, embraced for decades before anyone asked what 'indestructible' would mean once the substances were loose in the world.

1975, the Château de Rambouillet, France • The 52nd G7 summit is being held at Évian-les-Bains, France, from 15 to 17 June 2026, the same dates of the month as Rambouillet and again on French soil, fifty-one years on. But the club's weight has changed: the G7's share of global output has fallen sharply as China, India and others have risen, and the larger BRICS grouping presents itself as an alternative. More corrosively, the trust that made the original fireside format work is fraying, with tariff disputes among the members themselves, an ongoing US-Israel-Iran war, and a US administration at odds with traditional allies, so that even agreeing a joint communiqué can be a struggle. The lesson of Rambouillet is that the summit worked not because of rules or size but because a handful of leaders trusted one another enough to talk plainly; the institution outlived its founders, but trust is the part that does not automatically renew.

1930 to 2015 • In June 2026 the Jiangmen Underground Neutrino Observatory (JUNO), a 20,000 tonne liquid-scintillator detector about 700 metres underground in Guangdong, China, and the largest detector of its kind ever built, published its first physics result in Nature. From just 59 days of data (26 August to 2 November 2025) the collaboration measured two key neutrino-oscillation parameters to roughly 1.6 times the precision of all previous experiments combined, and demonstrated readiness to pursue its main goal: determining the neutrino mass ordering. That ordering feeds into one of the deepest open questions in physics, why the universe is made of matter rather than nothing. The particle Pauli was ashamed to invent, and was sure could never be found, has become the most-hunted ghost in physics, with cathedral-scale detectors built underground to study it, and at least three of its secrets (mass ordering, absolute mass, and whether it is its own antiparticle) still unclaimed.