Five things we're all wondering about.... Smoking ban takes effect ... if you want to continue the habit, you'll have to join the drug teenagers in Shenzhen. Hang Seng Index surges past 20,000 ... you know what this means - sayonara Genki Sushi, konichiwa Nobu! Earthquake results in mass internet disruption ... ICQ geeks were so frustrated they had to Google themselves, if you get my drift. Government to set up heritage review after Star Ferry pier fiasco ... they were especially shocked when video surfaced of some workers taunting the clock as they tore it down. Jockey Club trainers face inquiries after horses fail drug test ... we're still wondering how they convinced the horses to pee in a cup?