 Others have argued that understanding is not, in fact, so difficult to transmit. Suppose I ask why you are late for our meeting, and you tell me “traffic”. It then seems like you have transmitted your understanding to me quite directly—apparently just as directly as when you communicate your knowledge to me that the next train is coming at 4:15 (Grimm 2020). What seems required for successful transmission of understanding is thus that the right conceptual scaffolding is in place, on the part of the recipient. But supposing the scaffolding is in place, understanding can plausibly be transmitted in much the way knowledge can (Boyd 2017; cf. Malfatti 2019, 2020). Others argue that since something like propositional knowledge of causes entails at least a low degree of understanding, a low degree of understanding can be transmitted via testimony in the same way as knowledge can (Hu 2019).