Mechanization in 1801, displacing the centuries-old hand method of making individual sheets of paper. One of the first mechanical devices used in agriculture was the seed drill invented by Jethro Tull around 1700. The seed drill allowed more uniform spacing of seed and planting depth than hand methods, increasing yields and saving valuable seed. Mechanized agriculture greatly increased in the late eighteenth and early nineteenth centuries with horse drawn reapers and horse powered threshing machines. By the late nineteenth century steam power was applied to threshing and steam tractors appeared. Internal combustion began being used for tractors in the early twentieth
I Invented Sex just the thing to boost the already-substantial sales of Songz' third album." In the song's remix, Songz makes references to Tiger Woods, as he also refers to "going in like a Lil Wayne-Drake song." "DJBooth" said that Songz sings alongside, "Usher, who basically invented the modern sexual r&b blueprint that Songz is following, and Hilson, who more than holds her own alongside the boys with some scintillating vocals and hilarious 'soldier at attention' sexual entendres." The review goes on to state, "These three may not have invented sex, but they sure make listening to music while having sex more enjoyable."