Author: Vidya Menon

What AI hallucination means, real examples (including fake court cases), why AI makes things up according to OpenAI and NIST research, how common it is, and simple ways to spot and avoid it.

Wi-Fi 6, Wi-Fi 6E and Wi-Fi 7 compared in plain English, using Wi-Fi Alliance, IEEE and regulator sources: bands, channel width, Multi-Link Operation, 4K QAM, 6 GHz rules in the US, UK, EU and India, and whether upgrading is worth it.

A tested Hostinger coupon code for an extra 20% off: USD prices for web hosting and VPS, the upfront totals, renewal prices, our checkout test and how to apply it step by step.

What every invoice should include, a simple checklist and example, and the official requirements in the UK (GOV.UK and HMRC VAT Notice 700), the EU (VAT Directive Article 226) and Australia (ATO tax invoices), plus tips to get paid faster.

What spaced repetition is and why it works: Ebbinghaus’s 1885 forgetting curve (replicated in 2015), the 2006 and 2008 Cepeda studies on the best gap between reviews, an example schedule, how to use flashcards, and common mistakes.

What every part of a tyre size like 205/55 R16 91V means, using UN Regulation No. 30: width, aspect ratio, construction, rim, load index and speed rating charts in metric and imperial, the DOT date code and how to find your car’s size.

How to play UNO by the official Mattel rules: setup, matching, every action card, the Wild Draw Four challenge, the UNO call penalty, whether you can stack, scoring to 500 and two-player rules, with changes between the 2001, 2009 and 2025 instruction sheets.

LBW stands for leg before wicket. The five conditions of Law 36 (and ICC clause 36), the three questions umpires ask, a table of common situations, tricky points like full tosses and switch hits, and DRS.

Can you take a power bank on a plane? Hand luggage only, up to 100 Wh, and since 27 March 2026 no more than two and no recharging on board. The ICAO changes explained, India’s DGCA in-flight use rule, and an mAh-to-Wh chart.

The full anniversary gift chart from the Emily Post Institute: classic, modern, stone and flower for every year to 10 and each milestone to 60, where the list came from (1922 and 1937), and simple gift ideas.

Two-factor authentication (2FA) adds a second check after your password. The three factor types, 2FA vs MFA, methods ranked from security keys to SMS (CISA and NIST), how to turn it on, RBI’s 2025 rules and what to do if you lose your phone.

Note (October 2026): This guide has been updated because some certifications named in the original comparison table have been retired…