Dropbox 0.6.402 is a tool that goes even further. Backup files online, synchronise across computers (PC, Mac or Linux), but also share certain files with other users. For example, enable other users to see and download your favourite desktop images, photos of your kids or, if you're working in a team, the latest presentation you've finished and need others to approve.
Some parts of Atacama have not received rainfall for 500 years - but a sudden deluge of water upset the Desert's delicate biological balance
Spitzer Space Telescope could not spot Oumuamua, suggesting that it is actually pretty small
Greenland crater one of the 25 largest impact craters on Earth
This long-sought progenitor star was identified in an image captured by Hubble in 2007