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Hi Lifehacker, I'm a self-employed tradesman and struggle to keep good records of the work I've done and when. Obviously a physical diary would do the job but it would be great to have something that syncs with google calendar and allows photos to be added. Any recommendations?

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The SHA-1 cryptographic hash function may be 22 years old but it's still widely used today to validate Git repositories, document and digital certificates. We already know SHA-1 is insecure - security experts have been banging on about theoretical attacks facilitated by the algorithm for years. Now Google researchers have demonstrated a practical collision attack is possible. Here's what you need to know and why you should care.

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If you read certain tech sites, you'd be forgiven for thinking that the only smartphones worth owning are top-of-the-range flagship models (it's all they ever talk about.) In reality, very few people need a smartphone that costs $1200 - or even half that price.

For well under $500, it's possible to snap up a great handset with all the essential features - including fast performance, an excellent camera and decent battery life. Here are five of the best.

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Small improvements can all add up to make a big difference. And we're talking small improvements here. Tiny ones. It's clear that the idea of marginal gains has had a huge impact in the world of professional sports and performance. I wanted to find out how we can take some of these learnings and apply them to our own lives to make things a little easier, our routines a little healthier and our minds a little clearer. Here are five things simple things you can improve that will make a difference to your life in a small but meaningful way.