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...s first described by [[Robert Brown]] in 1828 as the "tremulous motion" of pollen grains (small solid particles of diameter on the order of a micrometer) sus

...us types of [[particulate matter]] derived from sources such as from dust, pollen and spores, sea spray, volcanoes, meteoroids and industrial activities.

...eed'') and Solidago (''goldenrod''); ragweed and goldenrod are herbs whose pollen is aggravating to some hay fever sufferers. These are commonly given during

...an uncommon occurrence, usually requiring hard parts (like teeth, bone or pollen), the [[fossil record]] is traditionally thought to provide only sparse and