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