At the dining table, pass to the right

Good dining table etiquette requires passing food and drink to the right. This rule is an attempt to impose order on the process of passing food and drink at the dining table. “What’s important is that when several dishes are being passed at the same time, they all go in the same direction,” Emily Post explains. In other words, the rule could just as easily have been ‘pass to the left’. But someone chose ‘right’, and so it is.
Using your iPhone to talk on the phone

“If you’ve got an iPhone, you’re likely to get better reception if you hold it in your right hand (and right ear) during a call,” according to a report commissioned by the Nordic Council of Ministers regarding how effectively different smartphones caught and sent radio signals. “This could be because the left-left combination adds a greater obstruction between the phone’s antenna and the wireless signal than a right-right combination would,” suggests Quartz, a business thought-leadership publication, in its post about the report.
While we’re on the subject of smart phones, here’s the best way to charge your device to make its battery last longer.
When communicating in sign-language

When signing, it doesn’t matter which hand you use, as long as you pick a hand and stick with it. “You should not switch back and forth between dominant hands,” advises Signing Savvy. “Most signers will be able to understand your signs no matter which hand you use as the dominant hand.” So, if you’ve been signing with your right as dominant, don’t switch, mid-conversation, to signing with the left.