Not long ago, the fastest Internet connection you could buy would be an ISDN line, unless you could afford a leased line. With ISDN, you paid for the time you were connected to the Internet. You had to physically log on and log off. With this in mind, browsing the web was a premium. It was easier to go online, grab and send your email and download your favourite websites, so you could browse offline later in the day. These days with our 'always on' connection, we might as well browse the web online. We've got all the time in the world.
If you're a web developer, time might still be at a premium. You've not got time to spend ages online analysing a site. It's easier to download the structure to your hard drive and then analyse how it was put together, in your spare time.
HTTrack 3.41-2 is a free tool that will enable you to download entire websites to your PC.
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