Kai and Yen stayed with us over the weekend; they’re about 18 months into a two-year trip around the world. Kai was pulling an interesting single-wheel T2 trailer. Unlike my BOB Yak, the rear wheel has what looks like an active torsion-spring suspension:

They’re taking the northern route across the US and Canada on their way back to Taiwan:

They make our bicycling adventures fade to pale gray… which is OK with us!