Bill Gates appeared before a congressional panel investigating the Jeffrey Epstein files, becoming the latest highest-profile figures to testify in the ongoing probe. Before his closed-door interview began, attention shifted to the billionaire's security team, whose heightened alertness sparked discussion. Gates told reporters he was "glad to voluntarily testify" as lawmakers examined documents detailing his past interactions with Epstein. The House Oversight Committee is expected to release testimony transcripts later, adding new details to the investigation. Here's what happened on Capitol Hill and why Gates' appearance is drawing widespread attention.