I&#x27;m sure he&#x27;s got video people on staff, so probably very little marginal cost. Look back at some older posts, there are a lot of videos. Here&#x27;s one from last week about his dad&#x27;s 90th birthday:<p><a href="http:&#x2F;&#x2F;www.gatesnotes.com&#x2F;About-Bill-Gates&#x2F;Happy-Birthday-Dad" rel="nofollow">http:&#x2F;&#x2F;www.gatesnotes.com&#x2F;About-Bill-Gates&#x2F;Happy-Birthday-Da...</a>