Nadia Rahim is a RECATOOLS editorial persona focused on statistics and data literacy: what confidence intervals, averages, correlations and margins of error actually mean, and how they are misquoted. Articles under this byline trace each claim to the primary statistical literature and show the working, so readers can check a number rather than take it on trust.

About this byline

Nadia Rahim is a RECATOOLS editorial persona for statistics and data-literacy coverage. Articles are produced and reviewed under RECATOOLS editorial supervision.

Editorial responsibility for this byline rests with Jeffrey Tan (Tan Seng Fei), RECASYS, Singapore. Our Editorial Policy sets out how sources are reviewed, how AI-assisted workflows are used, and how editorial desks and personas are defined.

154
Articles
Science
Primary beat
Jul 2026
Writing since
~985 min
Total reading
All 154 Science 88 Statistics 46 Sustainability 19 AI & ML 1

Articles Showing 51–60 of 154

A hand tracing Chinese characters on a printed practice sheet with a brush pen
Statistics

HSK 3.0 word counts by level, and how far old HSK words carry over

The syllabus the new HSK is tested on lists 11,000 words: 300 for level 1 up to 5,400 by level 6, with levels 7 to 9 sharing the rest. The often-quoted 11,092 belongs to the 2021 standard and dates from 2010. How much of the old six-level list carries over, and when the new exam starts.

30 Sep 2026 · 5 min read
A coypu swimming low in the water, the rodent whose tapering tail the fossil's resembles
Science

A 120-Million-Year-Old Mammal From China Swam With Platypus Feet and a Coypu's Tail

Dongoconodon platycauda, found in Liaoning, had webbed feet for pushing and a flattened tail for steering, and it replaced some teeth more than once.

30 Sep 2026 · 4 min read
The band of the Milky Way across a night sky
Science

Gas Clouds Near Earth Glow in Gamma Rays, and China's LHAASO Used Them to Count Cosmic Rays

Charged particles from deep space cannot be traced to their sources, so astronomers study the interstellar matter they strike. Five nearby targets matched what theory predicts.

30 Sep 2026 · 4 min read
A silver medal engraved with the word winner
Science

Nature Says Academies Named Researchers Without Consent and Offered Others Paid Memberships

A Nature investigation links several grand-sounding societies to shared virtual mailboxes and one recurring name. One held its 2026 annual meeting in Singapore.

29 Sep 2026 · 7 min read
Raindrops on a windscreen with blurred cars and red brake lights ahead
Science

Why stopping distance charts disagree at the same speed

At 90 km/h, Singapore's driving handbook says 95 metres, Britain's table gives 73 at a slightly higher speed, and US road-design values work out to 154. Each chart assumes a different driver and different brakes, and the assumptions can be read off its own numbers.

29 Sep 2026 · 6 min read
The Earth seen from space against a black background
Science

Why Some Decades Have Slightly Longer Days: Gravity Inside Earth

Earth's day drifts by milliseconds over decades. A model in Nature says gravity pulling the inner core into line with the mantle does most of the work.

28 Sep 2026 · 4 min read
An abstract rendering of a quantum processor chip
Science

Thirteen Trapped Ions Simulated Particles Appearing From a Snapped String

A Duke-led team reproduced string breaking, a process from particle physics, on a trapped-ion machine. A classical computer checked the answer and agreed.

27 Sep 2026 · 4 min read
A paved street in the ruins of Pompeii with Mount Vesuvius in the distance
Science

Pompeii's Eruption Date Let Geologists Check Argon Dating, and It Was 0.4% Off

Pliny the Younger's account gave a known age to test against. Eight crystals from Vesuvius also yielded a sharper half-life for dating rocks of any age.

27 Sep 2026 · 5 min read
Scattered letter tiles from a word game
Statistics

How many Indonesian words can you make from seven letters

A random rack of seven letters makes a median of at least 23 Indonesian words, but a word using all seven turns up for only a few racks in a hundred. Affixes barely change the first number and do change the second. And our own unscrambler's word list turned out to be film subtitles, about half of it not Indonesian.

27 Sep 2026 · 5 min read
An observatory dome at night under a starry sky
Science

Astronomers Find the First Planet Orbiting a Red Dwarf Backwards

Most planets orbit the way their star spins. GJ 3090 b, about 73 light-years away, goes the other way, and no companion massive enough to have flipped it has turned up.

27 Sep 2026 · 5 min read
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