rare color rare combination rare commodity rare complication rare complications rare condition rare condition called rare conditions rare congenital rare copy rare creature rare creatures rare day rare delicacy rare disease rare disease called rare disease day rare disease patients rare disease research rare diseases rare diseases and orphan rare disorder rare disorders rare due rare earth rare earth element rare earth elements rare earth metal rare earth metals rare earths rare editions rare element rare elements rare enough rare event rare events rare example rare examples rare exception rare exceptions rare experience rare eye rare family rare feat rare feature rare film rare find rare first rare fish rare flower rare flowers rare footage rare form rare form of cancer rare forms rare gas rare gases rare gem rare gems rare genetic rare genetic condition rare genetic disease rare genetic diseases rare genetic disorder rare gift rare glimpse rare gold rare good rare heart rare honor rare human rare i rare illness rare images rare in children rare in europe rare in france rare in nature rare in other rare in people rare in the united states rare individuals rare inherited rare instance rare instances rare interview rare it rare item rare items rare jewel rare kind rare look rare lung rare luxury rare man rare manuscripts rare materials rare metal rare metals