Guides & How-tos · Worked examples · Real numbers

Science guides

Step-by-step how-tos, head-to-head comparisons and honest roundups — every guide worked through with current figures, then backed by a RECATOOLS calculator or AI-directory entry so you can act on it.

185 guides published 15 topic areas Latest guide Aug 2026

All 185 AI & ML 47 Finance 27 Cybersecurity 24 Developer Tools 20 Science 10 Chinese Culture 9

A macro photograph of a green circuit board, rows of small black integrated circuits and resistors in sharp focus across the middle and blurring towards the edges.

Science 7 min

Why a 1,000-Qubit Computer Has Zero Usable Qubits

Physical qubits and logical qubits are different currencies. At current error rates one logical qubit costs about 1,681...

Nadia Rahim

Pub. 18 Aug

A magnifying glass resting on a clipboard of printed pages on a pale wooden desk, beside a phone, two pens, a laptop edge and a cup of coffee.

Science 7 min

How Much Faster Is Quantum Search, Actually?

We ran Grover's algorithm and counted the oracle calls. Over 4,096 items it looked 50 times against a classical average...

Kenji Tanaka

Pub. 18 Aug

A pyramid of old dice stacked five rows deep against a dark green background, each row showing a different pip count from six at the base up to a single worn blue die at the top.

Science 6 min

What Is a Qubit, Really?

A qubit is not a bit that is both values at once. We built a simulator and measured what actually separates one from a c...

Nadia Rahim

Pub. 18 Aug

A white cup of cappuccino dusted with chocolate sits on a saucer on a round metal tray, a spoon and a small biscuit beside it, with a person's folded arms resting on the wooden table behind, out of focus.

Science 7 min

What Actually Decides When Caffeine Wears Off

Coffee at four, still awake at midnight? The usual answer is that a substance is gone after ten half-lives — a tidy numb...

Nadia Rahim

Pub. 15 Aug

Laser-cut wooden tiles engraved with element symbols and numbers lie scattered across a pale table, with a few already slotted into the empty squares of a wooden periodic-table grid at the right.

Science 6 min

Why Isn't the Periodic Table Sorted by Weight?

The periodic table is not ordered by weight. Walk our own 118-element data from hydrogen to oganesson and the weight fal...

Nadia Rahim

Pub. 15 Aug

Electrician's tools laid out on a bench with a stripped three-core cable showing bare copper conductors.

Science 6 min

Why the Voltage-Drop Limit Is Really an Efficiency Limit

The voltage-drop limit in every wiring code reads as a performance rule. The current cancels, so the share of power burn...

Nadia Rahim

Pub. 14 Aug

Gloved hands closing a vernier caliper around a length of timber, with its scale in view.

Science 9 min

Significant Figures: The Digits Your Calculator Invents

We audited our own science calculators against the precision their inputs actually justify. Across 768 multiplications a...

Nadia Rahim

Pub. 13 Aug

Rows of young seedlings in small peat pots on a sunlit sill, lit from behind.

Science 5 min

What a Punnett Square Cannot Tell You

The square says three-to-one, and the lesson usually adds that in a family of four, three children will show the trait a...

Nadia Rahim

Pub. 12 Aug

Two rows of DIN-rail terminal blocks in a distribution cabinet, with numbered terminals and blue, yellow and green-and-yellow conductors landed on them.

Science 8 min

How to Size a Cable: the Six Checks, and the Three People Skip

Picking a cable looks like one lookup — find the current, read the size off a table. That answer is right in a cool plan...

Nadia Rahim

Pub. 9 Aug

A gloved hand in a lab coat filling a volumetric flask of dark purple solution on a laboratory bench, an analytical balance beside it.

Science 8 min

Dilute It Tenfold. The pH Moves One Unit, or None at All.

C1V1 = C2V2 looks like arithmetic but is a physical claim with four assumptions inside it. Dilute a strong acid tenfold...

Nadia Rahim

Pub. 8 Aug