How-To 30-Second Tech Trick: How to Choose the Right Size TV Warning: There's some math involved. By Doug Aamoth Nov. 13, 2013 Share Read Later Send to Kindle Related: 30-Second Tech Trick: How to Block Calls on the iPhone 30-Second Tech Trick: How to Charge Your Phone Faster 30-Second Tech Trick: How to Use Facebook in Pirate Mode 30-Second Tech Trick: How to Use Google as a Timer More 30-Second Tech Tricks