gelgels·vor 14 Jahren·discussI don't know her HN username, but Amy Zhou (Princeton) and I think one of her team members won last year and was present this year.
gelgels·vor 14 Jahren·discussSome credit cards have "virtual numbers" that you can use for shopping online. You set the limit that can be charged on the numbers and you're notified if someone charges over the limit to the virtual number. (citi credit cards)