Context: Evidence of wheeled vehicles appeared in the mid 4th millennium BC, near-simultaneously in Mesopotamia, the Northern Caucasus (Maykop culture) and Central Europe. The wheel initially took the form of the potter's wheel. The new concept quickly led to wheeled vehicles and mill wheels. The Sumerians' cuneiform writing system is the oldest (or second oldest after the Egyptian hieroglyphs) which has been deciphered (the status of even older inscriptions such as the Jiahu symbols and Tartaria tablets is controversial). The Sumerians were among the first astronomers, mapping the stars into sets of constellations, many of which survived in the zodiac and were also recognized by the ancient Greeks. They were also aware of the five planets that are easily visible to the naked eye.

Question: When did evidence of wheeled vehicles appear throughout the world?
Answer: mid 4th millennium BC

Question: What form did wheels initially take?
Answer: potter's wheel

Question: The writing system of the Sumerian's is the second oldest to have what done to it?
Answer: been deciphered

Question: What did the Sumerians map stars into?
Answer: sets of constellations

Question: How many planets were the Sumerians aware of?
Answer: five

Question: What type of vehicle was invented in 400 BC?
Answer: Unanswerable

Question: What  writing system predates heiroglphs?
Answer: Unanswerable

Question: What science was developed by Greeks?
Answer: Unanswerable

Question: How many planets did the Sumerians discover?
Answer: Unanswerable