Utilities4 min read
How to Scan Documents to PDF with Your Phone: Light, Angle and File Size
How to scan documents to PDF with an Android phone: light, angle, cropping and filters, what camera megapixels mean for a page, and keeping files small.
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Articles 145–168 of 990, newest first. To read by subject instead, start from a category or a topic hub on the blog’s front page.
- Utilities4 min read
How to Sign a PDF on Android, and What an Image Signature Is (and Is Not)
How to sign a PDF on Android, how an image signature differs from a certificate-based digital signature, and what the US ESIGN Act does and does not cover.
- Utilities4 min read
How to Split a PDF or Extract Pages
How to split a PDF or extract pages: page ranges, splitting by section or size, keeping the original, naming the parts and checking what each file contains.
- Utilities4 min read
How to Spot a Fake Trading Card: Print, Light and Weight Checks
How to tell if a trading card is fake: compare with a genuine card, check the print rosette and text under a loupe, try a light test and weigh it.
- Utilities3 min read
How to Store Trading Cards: Sleeves, Toploaders and Storage Conditions
How to store trading cards so they last: safe sleeve plastics, toploaders and boxes, temperature and humidity limits from the US National Archives and handling.
- Education4 min read
How to Study for a Discrete Math Exam: A Plan Built Around Definitions and Practice
A two-week plan for a discrete math exam: learn the definitions, test yourself instead of rereading, practise proofs from blank paper, and sit a timed mock.
- Utilities4 min read
How to Turn a Voice Memo into Text
How to turn a voice memo into text on Android: recording memos that transcribe well, converting them and editing the text into a note, plan or first draft.
- Utilities4 min read
How to Transcribe an Interview: Consent, Speakers and Checking Quotes
How to transcribe an interview: getting consent, recording well, labelling speakers, choosing a style, anonymising and checking quotes against the audio.
- Utilities4 min read
How to Transcribe Lectures and Study From the Transcript
How to transcribe lectures: getting permission, recording from the right spot, then turning the transcript into study notes, term lists and questions.
- Utilities4 min read
How to Update Apps on Android, and Why an Update Can Wait
How to update apps on Android: manual and automatic updates, Wi-Fi-only and per-app settings, Play Store and system updates, and when waiting is fine.
- Education5 min read
How to Write a Direct Proof: A Template and Five Worked Examples
A direct proof assumes the hypothesis and reasons forward to the conclusion. A reusable template, five worked proofs and the mistakes that cost marks.
- Education5 min read
The Hundred Years’ War: Why It Lasted 116 Years
England and France fought on and off from 1337 to 1453. The three phases, the truces between them, and why a war named by later historians ran 116 years.
- Utilities3 min read
What "In-App Purchases" Means on a Google Play Listing
What 'in-app purchases' means on Google Play: what counts, where the label appears, one-off purchases versus subscriptions and avoiding accidental buys.
- Education5 min read
The Inclusion–Exclusion Principle: Counting Overlaps Without Double-Counting
Inclusion–exclusion counts a union of overlapping sets: add the sets, subtract pairwise overlaps, add back triple overlaps. Formulas and four worked problems.
- Education4 min read
What Is an Index Fund? How Tracking an Index Works
An index fund aims to match an index's return before fees rather than beat it. How tracking works, why costs matter, tracking difference and the limits.
- Education4 min read
Injective, Surjective and Bijective Functions: How to Tell Them Apart
One-to-one, onto, or both? Definitions, worked examples on finite and infinite sets, how to prove each property, and how to count each kind of function.
- Education4 min read
Investment Fraud Red Flags: Guaranteed Returns, Pressure and Pump-and-Dumps
The warning signs the SEC lists: guaranteed high returns, pressure to act now, unsolicited contacts, odd payment methods and pump-and-dump stock tips.
- Languages4 min read
Essere vs Avere: Which Auxiliary Italian Verbs Take in the Past
Essere vs avere in the Italian past: which verbs take each auxiliary, why sono andata agrees but ho mangiato does not, and verbs that take both.
- Languages4 min read
Italian Greetings: Ciao, Buongiorno and When to Use Lei
Italian greetings by situation: ciao with friends, buongiorno and buonasera with everyone else, when to switch to Lei, and how to say goodbye.
- Languages4 min read
Italian Numbers: Counting From Zero to a Million
Italian numbers from zero to a million: the teens, why 21 is ventuno and 28 is ventotto, mille and mila, writing 25.000 and saying prices.
- Languages4 min read
Italian Plural Nouns: The Ending Rules and the Exceptions
Italian plural nouns: -o to -i, -a to -e, -e to -i, words that never change, amici vs funghi, camicie vs facce, and plurals like uova and uomini.
- Languages4 min read
Italian Prepositions and Their Contractions: Di, A, Da, In, Su
Italian prepositions explained: what di, a, da, in, su, con, per and tra mean, how they fuse with articles into del, al, nel and sul, and when they don't.
- Languages5 min read
Italian Pronunciation: Letters, Double Consonants and Stress
Italian pronunciation for beginners: hard and soft c and g, gli and gn, open and closed e and o, double consonants and where the stress falls.
- Languages4 min read
Ordering in an Italian Restaurant: Phrases, Courses and the Bill
Italian restaurant phrases for booking, ordering with vorrei and asking for il conto, plus the courses from antipasto to digestivo and what coperto means.