Fesul deuddeg y dylsen ni gyfrif, yn ôl rhai mathemategwyr. Gareth Evans sy'n trafod. Should we count in dozens, rather than in tens? Mathematician Gareth Evans joins Aled. Show more
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Fesul deuddeg y dylsen ni gyfrif, yn ôl rhai mathemategwyr. Gareth Evans sy'n trafod. Should we count in dozens, rather than in tens? Mathematician Gareth Evans joins Aled. Show more
Mae Radio Cymru wedi bod yn darlledu rhaglenni ers 1977. Radio Cymru has been broadcasting to the nation since 1977.
