You are about to send a text. You stop. Is it tough or tuff? Many people ask this every day. ...

You hold an ice cube. It melts. Is that chemical or physical? You burn a log. It turns to ash. ...

You are writing an email. You type “traveler.” Then you stop. Does it look wrong? Maybe it should be “traveller.” ...

You are typing a message. You stop. Is it “labour” or “labor”? You look at the screen. Both look right. ...