In 1850, it’s estimated it took 75 to 90 labor hours to produce 100 bushels of corn, and that would take 2.5 to 3 acres. By 1890, that reduced to 35 to 40 labor hours to produce the same 100 bushels, ...

Behind the upper primary set of incisors is a small set of secondary incisors often referred to as the peg teeth. The two lower incisors rest behind the upper primary incisors and occlude with the ...

While tyrannosaurid teeth are sharp and recurved, presumably for capturing and killing animals and/or ripping flesh from their carcasses, apatosaurids have small, peg-like teeth, more likely used ...