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Lifehacker's App Directory is a constantly maintained and updated directory of the best applications and tools for computers (Windows, Mac, and Linux) and smartphones (Android and iPhone).

A recent survey found that 66% of respondents had lost files on their PC, while Data loss has been enlisted as common experience amongst computer users.

Helpouts makes it easy for getting help for a computer glitch, a leaky pipe, or a homework problem as clicking a button?

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With Peerio, you control your data. Peerio integrates cloud storage with a messaging platform so you can safely keep your important files online and ready to send from anywhere. With end-to-end encryption, messages and files are encrypted before leaving your computer and can only be read by you and your recipients. Even we can't read them.

Why use Web 2.0 tools in science and math classes? The primary reason is they facilitate access to input and interaction with content through reading, writing, listening, and speaking. These tools offer enormous advantages for science and math teachers, in terms of helping their students learn using Web 2.0 tools. For example: * Most of these tools can be edited from any computer connected to the Internet. Teachers can add, edit and delete information even during class time. * Students learn how to use these tools for academic purposes and, at the same time, can transfer their use to their personal lives and future professional careers. * RSS feeds allow students to access all the desired research information on one page. * Students learn to be autonomous in their learning process.

What is Wolfram Alpha? It is a supercomputing brain. It provides calculates and provides comprehensive answers to most any science or math question. Unlike other search sources, you and your students can ask questions in plain language or various forms of abbreviated notation. Contrary to popular belief, Wolfram Alpha is not a search engine. Unlike popular search engines, which simply retrieve documents based on keyword searches, Wolfram computes answers based on known models of human knowledge. It provides answers which are complete with data and algorithms, representing real-world knowledge.

Leading user interface designers UI Centric today announced details and first images of their upcoming tablet computing interface for Windows 7 devices - codenamed Macallan.The Macallan user interface (UI) is designed from scratch specifically for tablet/slate form-factor devices. As a purpose built tablet UI it is not an adaptation of a desktop or mobile phone operating system UI. It aims to offer the most intuitive and responsive user experience of any tablet device.

The new feature allow users to know if they are still logged into a different computer or device, and enables them to remotely log-out, thereby eliminating the risk of account hijacking.

Google Docs is an easy-to-use online word processor that enables you to create, store, share, and collaborate on documents with your science and math students. You can even import any existing document from Word and Simple Text. You can work from anywhere and with any computer platform to access your documents.

Graham Attwell defines Personal Learning Environments (PLE) as an idea that firstly integrates "pressures and movements" like lifelong learning, informal learning, learning styles, new approaches to assessment, cognitive tools. Furthermore, PLEs are inspired by the success of "sticky" new technologies in ubiquitous computing and social software.

"A microblogging service such as Twitter is a promising new data source for Internet-based surveillance because of the volume of messages, [and] their frequency and public availability," according to Aron Culotta, assistant professor of computer science at Southeastern Louisiana University, who, in recent months analyzed 500 million tweets to track the flu.

Indeed cloud computing is here to stay, and spells the next generation of shared resources, software and general web experience...

With its sights set on reshaping current cross-platform Web collaboration, Mikogo the free online meeting tool has announced the release of its Beta version for Mac users. Available at no cost for both commercial and private use, Mikogo now allows anyone to start or join a meeting from either a Mac computer or PC, creating a more flexible screen sharing experience for all involved.