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