Actors Seth Rogen and Ben Affleck have both given evidence to the US Senate about causes close to their hearts.
In separate committee meetings, Rogen talked about the effects of Alzheimer's disease while Affleck testified about the Democratic Republic of Congo.
Rogen began with a joke, thanking senators "for the opportunity for me to be called an 'expert' at something".
Before giving evidence, Affleck met with US Secretary of State John Kerry for a press call.
He likened the experience to shooting his political thriller Argo, but said: "I get to see the real thing here. This part's much better."
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