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6 October 1995, at a conference in Florence

Michel Mayor and Didier Queloz told an astronomy conference in Florence on 6 October 1995 that periodic motion of the Sun-like star 51 Pegasi indicated an orbiting planetary companion. Their evidence came from radial-velocity observations with the ELODIE spectrograph at France's Haute-Provence Observatory.

The star's spectral lines shifted with a period of 4.2293 ± 0.0011 days and a semi-amplitude of 59 ± 3 metres per second. That implied a minimum companion mass of 0.47 ± 0.02 Jupiter masses at a separation the discovery paper put at about 8 million kilometres.

An announcement, not yet a confirmation

Eighteen months of ELODIE observations had produced the repeatable four-day Doppler signal, and checks of stellar rotation, pulsation and activity made non-orbital explanations unlikely enough for the pair to announce a planetary interpretation. Nothing was seen directly; the planet was inferred from the star's wobble.

The claim met with scepticism. Geoffrey Marcy and R. Paul Butler redirected an already scheduled Lick Observatory run to 51 Pegasi and, over four nights from 11 to 15 October, independently reproduced the signal — then posted their velocity plot on the still-new World Wide Web.

What was, and was not, a first

This became the first reliably identified exoplanet orbiting a normal, solar-type main-sequence star. Planets around the pulsar PSR B1257+12 had already been announced in 1992.

The peer-reviewed paper did not appear that day: Nature published it on 23 November 1995. Because the orbital inclination was unknown, the radial-velocity method established only a minimum mass.

6 December 1995: accelerated approval

The US Food and Drug Administration granted accelerated approval on 6 December 1995 to Hoffmann-La Roche's saquinavir mesylate capsules, marketed as Invirase. Roche had filed the application on 31 August, making the review 3.2 months long.

Saquinavir became the first HIV protease inhibitor approved by the FDA — an authorised attack on a different stage of HIV's life cycle from the nucleoside analogues already on the market.

What the label actually said

The approved indication was treatment of advanced HIV infection in selected patients, in combination with nucleoside-analogue drugs. Monotherapy was not approved.

The FDA's Antiviral Drugs Advisory Committee had recommended accelerated approval on 7 November after reviewing trials resting principally on surrogate markers. Those controlled trials described 936 HIV-infected patients, with CD4-count analyses over 16 weeks.

Verification came ten months later

Accelerated approval required later verification of clinical benefit, and the FDA converted it to traditional approval on 27 September 1996. Ritonavir boosting was a later dosing strategy; ritonavir itself was not approved until March 1996.

The approval landed at the peak of US AIDS mortality: 50,628 deaths among people with AIDS in 1995. CDC reported 21,222 deaths attributed to AIDS in 1997 and 17,047 in 1998, a decline that followed widespread combination therapy rather than any single medicine.

9 p.m., 20 September 2001

Nine days after the September 11 attacks, President George W. Bush addressed a joint session of Congress at the U.S. Capitol at 9:00 p.m. EDT on 20 September 2001; the transcript runs to 9:41.

He publicly identified al-Qaeda and Osama bin Laden as responsible for the attacks and accused Afghanistan's Taliban regime of sheltering and supporting the organisation. Lisa Beamer, whose husband Todd had died aboard United Airlines Flight 93, was introduced from the gallery near the beginning.

The demands

Bush demanded that the Taliban surrender al-Qaeda's leaders, release imprisoned foreign nationals, protect foreign workers, close terrorist camps, hand over their occupants and support personnel, and give the United States access to verify the closures.

He declared that the campaign would extend beyond al-Qaeda to every terrorist organisation "of global reach," and that governments continuing to harbour or support terrorism would be treated as hostile regimes. Tony Blair had crossed the Atlantic to sit in the chamber, where Bush recognised him and thanked Britain as America's closest ally.

A speech, not a declaration of war

This was not a constitutional declaration of war: Congress had already enacted the Authorization for Use of Military Force on 18 September. Bush used the phrase "war on terror," but the address did not formally create or legally name an entity called the "Global War on Terrorism."

He also announced a Cabinet-level homeland-security position and named Pennsylvania governor Tom Ridge to coordinate it. That was a White House office, formally established by executive order on 8 October 2001 — not the later Department of Homeland Security.

00:58:53 UTC, 26 December 2004

A great megathrust earthquake began off northern Sumatra at 00:58:53 UTC on 26 December 2004 — 07:58:53 in western Indonesia — at a depth of about 30 kilometres. USGS gives the official magnitude as Mw 9.1, while ultra-long-period analyses have produced estimates around Mw 9.3.

The rupture came from thrust faulting where the India Plate descends beneath the Burma microplate along the Sunda subduction zone. Vertical displacement extended northward for roughly 1,200 kilometres or more, over a duration the reviewed USGS event page puts at more than 500 seconds.

Twenty minutes to shore

The displaced seafloor generated waves travelling both toward nearby coasts and across the Indian Ocean. Parts of northern Sumatra were struck within about 20 minutes, and no official Indian Ocean warning system existed to alert the threatened coasts.

Thailand, Sri Lanka, India, the Maldives and East Africa were hit over the following hours. Maximum documented runup reached 51 metres in Aceh Province; more than 5,000 kilometres away in Somalia, surveyed runup approached 10 metres.

227,899

NOAA's database lists 227,899 people killed or missing and presumed dead across 15 countries, 167,540 of them in Indonesia. About 1.7 million people were displaced, and material losses were estimated at the time at approximately US$10 billion.

A tsunami is a sequence of waves, and later ones can be larger than the first. On Simeulue, oral accounts of a 1907 tsunami had taught residents to seek high ground after strong shaking; seven people died there among a population of nearly 80,000.

30 March 2017: a used booster launches SES-10

At 22:27 UTC on 30 March 2017, SpaceX launched the SES-10 communications satellite from Launch Complex 39A at Kennedy Space Center. The Falcon 9's first stage, B1021, had already flown once.

Its first flight was the CRS-8 mission on 8 April 2016, after which it landed on a converted barge. In between, SpaceX took it to the factory, partially disassembled it — engines removed — inspected it, and refurbished it for a commercial customer.

Landing the same stage twice

The upper stage placed SES-10 into geosynchronous transfer orbit.

After separation, B1021 performed entry and landing burns and came down on the drone ship Of Course I Still Love You, its second recovery. This was the first successful reflight of a complete orbital-class liquid-fueled rocket stage.

What the flight did not settle

"First reflight of an orbital-class rocket" is SpaceX's shorthand and it compresses the precise claim. The second stage was new, and B1021 itself never reached orbit on either flight.

Reusing hardware was not new either: Space Shuttle orbiters flew repeatedly, and Shuttle solid-rocket components were recovered and reused. What was new was reflying an intact liquid-fueled booster stage.

SES received an undisclosed discount for accepting a previously flown stage. The mission demonstrated the full recover-inspect-relaunch-recover cycle without establishing any public, quantified reduction in launch price.

Notice No. 1, effective at 10:00

On 23 January 2020, Wuhan's epidemic-control command announced that from 10:00 local time the city's buses, metro, ferries and long-distance coaches would cease operating.

The same notice told residents not to leave Wuhan without a special reason and temporarily closed the airport and railway-station channels used to leave the city. Roughly 11 million people lived there.

The opening layer, not the whole lockdown

China banned travel to and from Wuhan as a cordon sanitaire meant to limit the novel coronavirus's geographical spread. Authorities acted after human-to-human transmission was confirmed and cases rose during the heavy Lunar New Year travel period.

Notice No. 1 named transit suspensions and outbound closures. Home confinement, private-vehicle rules and centralized quarantine were introduced or tightened in later stages.

The airport and railway provisions covered the routes used to leave Wuhan, which is narrower than halting every flight and train.

The WHO committee met the same day

The WHO emergency committee, meeting on 23 January, was told that public-transport systems had been closed in Wuhan and nearby cities. It did not recommend declaring a Public Health Emergency of International Concern; that declaration came on 30 January.

The figures put to the committee that day were 557 confirmed cases in China and 17 deaths among them. On 23 January, neither COVID-19 nor SARS-CoV-2 had yet become the official names for the disease and virus.

18 November 2020: the primary endpoint reported

Pfizer and BioNTech announced on 18 November 2020 that the protocol-specified final efficacy analysis of their ongoing Phase 3 trial of BNT162b2 had met all primary efficacy endpoints.

The analysis counted 170 symptomatic COVID-19 cases: 162 among placebo recipients and 8 among vaccine recipients, corresponding to 95% efficacy from seven days after the second dose. Ten severe cases had occurred — nine in the placebo group, one in the vaccinated group.

What "final" and "95%" actually covered

"Final" meant the protocol-specified primary endpoint analysis, not the end of the trial or of participant follow-up. Enrollment stood at 43,661, of whom 41,135 had received a second dose by 13 November.

The 95% was trial efficacy against symptomatic COVID-19 under the study's case definition. It did not establish 95% prevention of infection, transmission, hospitalization or death, and ten severe cases were too few to carry claims about preventing deaths.

Filed with the FDA two days later

The companies said the FDA's required safety-data milestone had been reached and that the monitoring committee had reported no serious vaccine-related safety concerns — which is not a claim of no adverse events. The release itself disclosed severe solicited reactions, fatigue at 3.8% and headache at 2.0% after dose two.

Nothing was authorized on 18 November. Pfizer filed its U.S. emergency-use request on 20 November, and the peer-reviewed trial report followed in the New England Journal of Medicine on 10 December.

Christmas morning at Europe's Spaceport

An Arianespace Ariane 5 carrying the James Webb Space Telescope lifted off from Europe's Spaceport in French Guiana at 12:20 UTC on 25 December 2021 — 7:20 a.m. Eastern, Christmas morning.

About three minutes in, the rocket jettisoned the payload fairing and then performed a special roll maneuver intended to keep solar radiation off the newly exposed observatory.

On its own after 27 minutes

Webb separated from the upper stage 27 minutes after launch and began traveling toward its planned orbit around the Sun–Earth L2 point, roughly 1.5 million kilometres (1 million miles) from Earth.

About 30 minutes after liftoff the solar array unfolded. The mission-operations center in Baltimore confirmed that the observatory was powered and in good condition.

The launch was not the arrival

Nothing reached L2 that day. The cruise took about a month, and Webb entered its L2 halo orbit in January 2022 — a large orbit around the point rather than a parking spot on it.

The roles behind the launch were equally distinct: Arianespace operated Ariane 5, ESA supplied the launch service and vehicle adaptations, and the Space Telescope Science Institute handled mission operations and science support rather than the rocket.

12 May 2022: the ring goes public

At coordinated press conferences on 12 May 2022, the Event Horizon Telescope Collaboration unveiled its first image of Sagittarius A*, the compact object at the center of the Milky Way — about 27,000 light-years away and roughly four million solar masses.

The picture was reconstructed from radio observations made over several nights in April 2017 by eight observatories in Chile, Mexico, Spain, Arizona, Hawaii and Antarctica, linked through very-long-baseline interferometry.

An average, not an exposure

Sagittarius A* changed on minute-scale timescales while it was being observed, so the released image is an average of thousands of reconstructions that all fit the data rather than a single camera exposure.

It is not an optical photograph and it does not show the black hole. The bright ring is glowing gas and gravitationally bent radio emission around a dark central shadow, measured at 51.8 ± 2.3 microarcseconds across. The orange is representational; the observing wavelength was about 1.3 millimetres.

Five years of analysis, then the observing data

The collaboration described five years of correlation, calibration, simulation and image reconstruction between the 2017 observations and this release, drawing on more than 300 researchers at 80 institutions.

The result appeared as a six-paper special issue of The Astrophysical Journal Letters, alongside a public release of the April 2017 observing data. It was the first image of Sagittarius A*, not the first image of a black hole — EHT had revealed M87* in 2019.

30 November 2022: a free research preview

OpenAI publicly introduced ChatGPT on 30 November 2022 and invited people to try it, free, as a research preview.

The chatbot ran on a dialogue interface designed to answer follow-up questions, challenge incorrect premises, acknowledge mistakes and reject some inappropriate requests. OpenAI identified the launch model as a fine-tuned member of the GPT-3.5 series, trained on Microsoft Azure AI supercomputing infrastructure.

Trainers who played both sides of the conversation

The announcement described supervised fine-tuning in which human AI trainers wrote both halves of sample conversations — playing the user and the assistant — followed by reinforcement learning from rankings of alternative responses. OpenAI called ChatGPT a sibling of InstructGPT and said transformed InstructGPT data was mixed into the dialogue dataset.

Users were enlisted as testers from the first day. OpenAI asked for reports of problematic answers and advertised a feedback contest offering up to $500 in API credits.

What launched, and what did not

ChatGPT was the product and the interface; GPT-3.5 was the model family beneath it. GPT-4 did not reach ChatGPT Plus until March 2023, and the November release was a free, text-based preview rather than the later multimodal subscription product.

What shipped alongside the chatbot was a warning. OpenAI said in the same announcement that the system could produce plausible but false answers, guess at ambiguous requests and sometimes respond to harmful instructions.

9 March 2022: the maternity wing

An airstrike hit the grounds of Primary Medical and Sanitary Aid Centre No. 3 — commonly called Maternity Hospital No. 3 — in Mariupol on 9 March 2022, significantly damaging its maternity and children's wing.

Patients, pregnant women and staff were evacuated through shattered rooms and burning vehicles. Associated Press journalists, still reporting from inside the besieged city, photographed the aftermath.

The claims about the building, tested

Russian officials denied responsibility or alleged that the facility was non-operational or being used as a military base. The UN Independent International Commission of Inquiry later found the hospital was functioning, found no support for those allegations, and concluded that Russian armed forces had conducted an indiscriminate attack.

The commission also held that treating wounded Ukrainian soldiers in a neighbouring oncology building did not strip the hospital of its protected status. The crater left in the courtyard was deep enough to help investigators identify the attack as an airstrike.

Counts and condemnation

UNICEF executive director Catherine Russell condemned the reported attack on 9 March and called for an immediate ceasefire and protection of civilian infrastructure. British prime minister Boris Johnson, the White House and other international figures condemned the strike that day and the next.

By 10 March, Mariupol authorities reported three deaths, including a child, and 17 people injured. The UN inquiry later documented the death of at least one pregnant woman and her unborn child.

8 December 2024: Damascus changes hands

Opposition forces entered Damascus on 8 December 2024 against little or no organized resistance, after government troops abandoned their positions — many discarding uniforms rather than fight. A statement broadcast on state television, the same system that had served Assad, announced his overthrow.

Bashar al-Assad left Damascus that morning. A statement later attributed to him said he went to Russia's Hmeimim airbase and was evacuated that evening; Russian state media reported that he and his family reached Moscow and received asylum.

Who actually took the city

Hay'at Tahrir al-Sham led the northern offensive that began on 27 November and captured Aleppo, Hama and Homs, but it was not the only force involved. The Southern Operations Room advanced from Daraa, Suwayda and Quneitra and helped encircle and enter the capital.

Russia, Iran and Hezbollah did not mount the intervention that had previously sustained Assad. Russia's Foreign Ministry said he had left office and ordered a peaceful transfer of power.

The prisons opened before the caretaker government formed

Insurgents opened government prisons, including Sednaya, releasing detainees as the security apparatus collapsed. Videos from Sednaya showed women leaving packed cells, some of them held with their children.

Prime Minister Mohammed Ghazi al-Jalali stayed in Damascus and said the existing government was ready to hand its functions to a transitional authority. Mohammed al-Bashir was not appointed caretaker prime minister until 10 December.

The day ended 61 years of continuous Ba'ath Party rule and Assad's 24-year presidency. It did not end every armed conflict in Syria.