How QR code scams (quishing) work, based on FBI and FTC warnings: fake parking meter stickers, delivery and account messages, warning signs, seven safe-scanning habits, and what to do if you scanned a fake code.

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 the numbers under a barcode mean, using GS1’s own rules: the prefix (and why it does not show country of origin), a prefix list, book and magazine codes, how to calculate a check digit, and what PLU numbers on fruit stickers mean.

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.

Smoke alarm maintenance made simple: test monthly, change 9-volt batteries yearly and replace every alarm at 10 years (US Fire Administration and NFPA), where to install them, why they chirp, and how local rules such as Scotland’s can differ.

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.

Short ton, long ton and tonne compared using NIST, BIPM and UK legal definitions: exact kilogram values, why two tons exist (100 vs 112 lb hundredweights), conversion factors with examples, and other units called a ton.

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.

How long leftovers last in the fridge and freezer, from USDA and FoodSafety.gov charts, why cooked rice needs eating within 24 hours (Food Standards Scotland), the 2-hour rule, and how to store and reheat leftovers safely.

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.

One of the most common and most mistaken beliefs about domestic violence cases is that the accuser controls them. People…

Every Nobel laureate linked to India, sorted clearly: those in India when they won, India-born laureates abroad, those born in British India, and other links, checked against the Nobel Foundation’s own records, including 2026 Peace laureate Navi Pillay.