Pelletier discovered seven previously undocumented messages carved into the 3,300-year-old Luxor Obelisk in Paris.

But exactly how much did these obelisks weigh? In this NOVA game, you can find out by comparing the weight of the largest ancient obelisk to a herd of elephants.

Question: What is the estimated time (months, years) that it took the ancient Egyptians to erect an obelisk (e.g., the largest one), from the first chip in the quarry to the final touches of the ...