Yr Athro Deri Tomos sy'n ymuno ag Aled i drafod arogleuon y corff. Why does everyone smell differently? Professor Deri Tomos joins Aled. Show more
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Yr Athro Deri Tomos sy'n ymuno ag Aled i drafod arogleuon y corff. Why does everyone smell differently? Professor Deri Tomos joins Aled. Show more