This GSM-networked box hangs inside a front door and alerts the homeowner´s cellphone when a vistior buzzes the intercom. A code punched into the phone then opens the door. Waleli GSM-doorbell $600; waleli.com
Amplify most acoustic guitars, and you lose that crisp sound in fuzzy feedback. This one uses four mics placed in the audio sweet spots and lets you control them individually, so you can tune out squawk and dial in dulcet tones. Yamaha CPX900 $850; yamaha.com
Unexplained jitters when tackling easy tap-ins have befallen even the most legendary pros. Now, a group of scientists hopes to reveal which sections of the brain are responsible for choking