Miller Farm, the terminus of Van Syckel's pipeline, in 1868. The oil was pumped to Miller Farm and then transported by railroad. Drake Well Museum/Courtesy of PHMC hide caption

itoggle caption Drake Well Museum/Courtesy of PHMC

Drilling rigs dot the landscape near Calumet, Okla., in April 2013. Oklahoma's economy blossomed during the domestic fracking boom, but as the price of crude oil drops, that could change. Sue Ogrocki/AP hide caption

itoggle caption Sue Ogrocki/AP

An oil well in Garden City, Texas. With prices plunging, oil companies are laying off thousands of workers. Spencer Platt/Getty Images hide caption

itoggle caption Spencer Platt/Getty Images

Without horsepower, they rely on human power: Mother and daughter-in-law Sheela and Sunita Devi shred sugarcane into feed. Ibrahim Malik for NPR hide caption

itoggle caption Ibrahim Malik for NPR

Iranians commemorate the 36th anniversary of the Islamic Revolution near the Azadi Tower in Tehran on Wednesday. While many Iranians would like to reorder relations with the West, there's also plenty of skepticism about whether it will actually happen. Ebrahim Noroozi/AP hide caption

itoggle caption Ebrahim Noroozi/AP

A functioning oil rig sits in front of the capital building in Oklahoma City, Okla. The oil industry is an important employer in the state, but officials are concerned a technique used to dispose of wastewater from oil extraction is behind a surge in earthquakes here. Frank Morris/KCUR hide caption

itoggle caption Frank Morris/KCUR