Listener Alberto wants to know how handshakes became the go-to greeting in many parts of the world, and why extended shakes often take center stage when world leaders meet. Paleoanthropologist and handshake expert Ella Al-Shamahi hands us some answers, and deconstructs a handshake so bad it’ll leave you shook.

Today, we’re rerunning one of our favorite episodes. Listener Gab is clumsy: white sweaters, stemmed wine glasses and sharp edges are off the table. Can Gab learn to be less clumsy? Professional steady-hand Bryan Berg and kinesiologist Priscila Tamplain share tips for foiling fumbles. Special thanks to Carl Gabbard and Michael Wade.

Today’s episode comes from our friends at the podcast Twenty Thousand Hertz. They investigated the Netflix “ta-dum” – the sound effect that rings out when you queue up a Netflix show. It’s so iconic you probably can hear it in your head, but it almost sounded very, very different (think bleating goats). Find more episodes from Twenty Thousand Hertz here.