Holiday times are here! Do you own a two-wheeled suitcase? If so, you have probably experienced the problem of it rocking alarmingly from side-to-side when you drag it along. Scientists have come up with a solution: don’t slow down but speed up instead! Alternatively, you can lower the handle of the suitcase as close to the ground as possible. Alternatively, why not just buy a four-wheeled suitcase!