Yr Athro Deri Tomos a Bryn Tomos yn edrych ar wyddoniaeth pontydd. Professor Deri Tomos and Bryn Tomos look at the relationship between science and bridges. Show more
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Yr Athro Deri Tomos a Bryn Tomos yn edrych ar wyddoniaeth pontydd. Professor Deri Tomos and Bryn Tomos look at the relationship between science and bridges. Show more
Mae Radio Cymru wedi bod yn darlledu rhaglenni ers 1977. Radio Cymru has been broadcasting to the nation since 1977.
