Learn how to secure your WhatsApp chats and files on your Mac or Windows PC by setting up a password lock.

Learn how to turn off sponsored website shortcuts that Firefox inserts into your row of websites on the start page.

Find out how to save one, a few, or all photos and videos from a shared iCloud album to your iPhone, iPad, and Mac in just a few quick steps.

Learn how to downgrade your iPhone or iPad from iOS 27 developer beta or public beta back to iOS 26 non-beta.

Find out how to enter the recovery screen on iPhone or iPad running iOS 27 or iPadOS 27 to fix issues or erase your device and start fresh.

Find out which toggles to turn off so other Instagram users and Meta’s Muse AI tool cannot use your photos for image generation.

Find out how to remove the audio or microphone button from the text field in the iOS 27 Messages app so you don’t trigger them accidentally.

In this piece, I talk about some small areas where I think improvement is required to make the CarPlay experience even better.

Find out how to see all your identity cards, passport, driving license, and other identity documents’ photos in one place in iOS Photos app.

Learn how to rate your photos and videos from 1 to 5 stars (★★★★★) for better organization and easier searching in iOS 27 and macOS 27.

Find out how to react to a shared photo with your preferred emoji in iCloud shared albums in iOS 27, iPadOS 27, and macOS 27 Golden Gate.

Use touch to interact with Mac app windows while using Sidecar on an iPad running iPadOS 27 and Mac running macOS 27 Golden Gate.

Learn how to export a slideshow as a video in the Photos app on iPhone, iPad, and Mac running iOS 27, iPadOS 27, and macOS 27 Golden Gate.

Learn how to increase the system text size on Apple TV in tvOS 27 if you have difficulty seeing the on-screen options in their default size.

Learn how to use the new Find My app on Apple Watch in watchOS 27 to keep track of devices, AirTags, and friends straight from your wrist.

Kinematics: The Velocity-Time Function Author’s Preface: A Collaborative Approach to Lesson Development The intention behind what I hope will be a series of articles on Kinematics (this one being the first) is to begin an open, collaborative process of lesson development on Physics Forums. In order to expedite this workflow, I am making deliberate use...

Introduction This article is written by way of a reference for my longstanding PF colleague and prolific poster of challenging Maths/geometry problems @chwala . The particular post this article will discuss is an example of one such problem which he raised on Physics Forums. https://www.physicsforums.com/threads/find-angle-adb-in-this-isoceles-triangle-given-some-extra-information.1063874/ The Problem We take the liberty of including the original...

Introduction The concept of a group is as simple as it gets: a set with a binary operation like addition and a couple of natural laws like the requirement that the order of two consecutive operations does not matter: ##(1+2)+3=1+(2+3).## That’s it. The concept of a group is so simple that I still wonder why...

The Einstein Field Equations (EFE) are ten coupled, nonlinear differential equations that describe how matter and energy determine the curvature of spacetime. First published by Albert Einstein in 1915, they form the mathematical core of general relativity, linking spacetime geometry to its energy and matter content through the equation [itex]G_{\mu\nu} = \frac{8\pi G}{c^4} T_{\mu\nu}[/itex]. Key...

Introduction The figure on the right shows a “double-double” Atwood machine with three ideal pulleys and four masses.  All pulleys are released from rest simultaneously.  Which of the choices below describes the angular motion of the top pulley P after some time has elapsed and why? It rotates clockwise with increasing angular speed. It rotates...