Ratings

This charming little video demonstrates the principle of resonant frequency using oscillating metronomes. The mechanical wind-up metronomes used worldwide during the dreaded Saturday piano lesson employ an inverted pendulum to keep even time intervals. The resonant frequency of the pendulum is adjusted by moving the mass up and down. Sliding the mass higher up the rod decreases the resonant frequency of the pendulum by increasing its rotational inertia.

Not necessarily. It’s hard to ignore MS Office, but you don’t need to blow 400 bucks to get your work done. In fact, you don’t need to install any programs at all. Sign up for the free Google Docs (documents.google.com) or Zoho (zoho.com), and you can do everything in a Web browser. The programs look similar to Word, Excel and PowerPoint and offer all the same features (save for a few lesser-used ones like certain spreadsheet formulas). Zoho even kicks in a few extra applets like a Wiki-building tool. Best of all, these applications let you access your files from any computer that’s online. If you don’t have reliable Internet access or are more comfortable installing programs on your computer, there’s no shortage of competition, either.

Personal information in the digital realm is always susceptible to malicious activity. Passwords can be stolen from a database, credit card numbers swiped at the point of sale; even the new American passports contain RFID chips which critics claim can be surreptitiously read. Now, even a pacemaker can be hacked from the outside.

Remember Innerspace? Dennis Quaid and his submarine-like ship are shrunk to the size of a cell and accidentally injected into the hapless Martin Short. Quaid navigates the hazards of Shorts bodily functions in order to plot his escape. Twenty years on, there's something rather quaint about it. A vessel the size of a cell? With a pilot inside? Compared to todays innovations in nanotechnology, it's akin to using a tractor trailer to find your way through a corn maze.