While the United States continues to ignore its public health problem of gambling addiction, the first national study of the gambling habits of Australia’s youth has found a tenth of kids aged 10-14 fit definitions of ‘‘at-risk’’ or ‘‘problem’’ gamblers. And a third have adults willing to place bets on their behalf. Almost a third of kids aged 10-14 said they had played electronic gambling machines in the previous year, more than half had purchased scratch tickets.