 
 <prompt> Wetin be di type of device wey dem first develop for Nabta Playa? Based on di question wey dey before dis one, write small tori wey get di answer. E fit be 1 - 20 sentences. Context: <response>: During di Neolithic Era, before desertification start, around 9500 BCE di central Sudan bin dey rich well well dey support plenty people wey dey move up and down for wetin be desert now, like Wadi el-Qa'ab. By di 5th millennium BCE, di people wey dey live for wetin dem dey call Nubia, dey fully involved for di "agricultural revolution", dey live settled life with plants and animals wey dem don domesticate. Saharan rock art of cattle and herdsmen dey show say dem get cattle cult like wetin dey Sudan and other pastoral societies for Africa today. Megaliths wey dem see for Nabta Playa na clear example of probably di world's first known archaeoastronomy devices, wey happen before Stonehenge by like 2,000 years. Dis complexity, as dem see for Nabta Playa, and as e dey show for different levels of authority within di society there, likely form di basis for di structure of both di Neolithic society for Nabta and di Old Kingdom of Egypt. 