Some mathematical problems sound deceptively simple but take over a century to crack. The four-colour theorem is a classic case, stumping mathematicians from its 1852 origin until computers finally helped settle it.
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Which British woodland bird's name literally describes the sound it makes while feeding on tree bark?
πΏ Nature & Animals Β· 26 votes
Should councils be allowed to fluoridate tap water without a local referendum to fight tooth decay?
π©Ί Health Β· 25 votes
Wat heb je liever?
π€ Dilemma Β· 24 votes
Rank these Doctor Who actors by the year they first appeared as the Doctor, earliest first.
π³ 26 votes