Humans love to control how they feel. Booze and coffee have been perking us up and lubricating social situations for millennia. Mood-enhancing technology, on the other hand, usually tries to emulate a cup of joe or a glass of wine but without the need for rinsing your liver. I’m generally OK with pumping chemicals into my body, but with a few mood-changing gadgets catching my eye in the run-up to this year’s CES, I thought I’d give some a go. The hope was that I could avoid the usual uppers-and-downers routine that a week in Vegas demands.