A ydym yn gwybod mai dweud celwydd mae rhywun? Y cyn-blismon Alun Hughes sydd â'r atebion. Can we tell when someone is lying? Retired police inspector Alun Hughes has the answers. Show more
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A ydym yn gwybod mai dweud celwydd mae rhywun? Y cyn-blismon Alun Hughes sydd â'r atebion. Can we tell when someone is lying? Retired police inspector Alun Hughes has the answers. Show more
Ail wasanaeth BBC Radio Cymru sy'n cynnig sioe frecwast bob bore'r wythnos.
