Someseaurchins海胆havevenomous(toxin)spines

In1861itseemedinevitablethattheSouthernstateswouldbreakawayfromtheUnion.

Withlasersscientistscanprobemanyphysicalprocesses,suchascombustion,oncebeyondourken.视野

TheSalkvaccineisamajorfactorinthefighttoeradicatepolio.

Alligatorsstillexistinsomeofthedank潮湿swampsandbayous小海湾ofAlabama'scoastalregions.