iOS: With iOS 11, Apple rolled out a new screenshot tool for the iPhone and iPad that allows you to quickly edit your screenshot after you capture it.

Apple recently added Night Shift to macOS, which changes the colour temperature of your screen based on the time of day in the hopes that it will help you sleep better. Before the launch of Night Shift, f.lux was the go-to tool for doing this. Let's see how they compare.

Mac: An app like F.lux is great for adjusting your screen's temperature, but not everyone wants to stare at an orange screen just to make it more readable. Lumen's a tool that automatically adjusts the brightness without fudging around with the temperature.

We're all surrounded by screens, but few of us know how they really work. If you're looking to teach your kids how displays work (or learn for yourself!) and you need a display for a Raspberry Pi, the Kano Screen Kit is a reasonably priced, portable, dedicated display that you build yourself.

We love multiple monitor workstations, but "Ultrawide" displays, packing resolutions that rival two or three panels side-by-side, are looking better and better these days. After all, having more than one monitor doesn't automatically make you more productive. Here's how these new ultrawide monitors differ from a dual-screen setup, and when you might consider buying one.

Resolution is important, but the size of your screen makes just as much of a difference. 720p looks great on a 5-inch screen, but it will be much less sharp on a 50-inch screen. This is what we refer to as pixel density, or pixels per inch (PPI).

Dear Lifehacker, I have recently cracked my laptop screen. The crack is on the underside of the glass, in the bottom right corner (as pictured). Is there anything that I can do to make it less obvious? I don't want to pay $100 dollars for the replacement screen? Thanks, Screen Saver

Dear Lifehacker, My Asus U36sg is a nice, light notebook with good features, but the screen is 1366 by 768 and nothing to write home about. Assuming I could afford the $150 hardware cost, I would like to try putting something like a B133HAN03 1600 by 900 screen in its place. How far out of my depth am I? Is this a non-starter and I'm totally deluded? Thanks, Screen Queen

Dear Lifehacker, What is the best way to clean the screens of my laptop, LCD monitor, LCD TV and (MacBook) Retina screen? There are so many "don't do this", but no "do this" articles around. What is the best way to get my screens looking amazing without hurting them? Thanks, Smudged

Dear Lifehacker, In the old days of CRTs, my dad would warn me about dreaded "burn-in" on my computer screens and TVs. I know there was a big debate about plasma TVs and burn-in too, but is it still a problem? Does it affect LCDs? Do I need to care at all?

QuickRes is a simple app that enables HiDPI mode on your Mac, allowing you to change to lower resolutions without making things look pixelated and fuzzy. For those who own Macs with retina displays, you also gain a quick resolution switcher in your menu bar.

Dear Lifehacker, I am looking to buy a new extra screen for my MacBook Pro for university. However, on my student budget I cannot afford a screen from Apple. So I am looking for a cheaper option. What would you suggest? And how do you get USB ports working on a non-Mac screen if you hook up your MacBook Pro with a DVI? Thanks, Screen Student