Mexico’s vast capital — Ciudad de México, the largest city in the Americas — is threatened by a severe water crisis.
America is changing how it gets its energy, and coal is losing out.
Many structures built by ancient Romans around 2,000 years ago are still standing, and some are still in excellent condition. Over the last decade, researchers have come discover the Romans’ secret concrete recipe that has maintained so many of its now-ancient buildings.
Just because something is difficult doesn’t mean it’s impossible. Over the past centuries, archaeologists, historians, and engineers have reconstructed a great deal of the technology and science used to build the Egyptian pyramids. This week we look at ancient Egyptian mathematics, building techniques, tools, and culture to reconstruct the Great Pyramid’s construction.
Who built the pyramids? The colossal geometric monuments found at Giza and elsewhere in Egypt are some of Earth’s most impressive constructions. Pyramids are truly wonders of the ancient and modern world.
A better way for animals to cross the road.