Scientists are trying to understand how some ancient buildings have lasted for centuries in hopes of making modern buildings more durable. Materials like Roman concrete and Maya plaster have held up structures for thousands of years. Meanwhile, the concrete that makes up our modern world only lasts about a century. Researchers have found that Roman engineers used methods and materials that gave their concrete the power to heal itself over time. And Maya masons added tree extracts to strengthen the lime plasters that coated their temples. Some researchers think uncovering this lost knowledge could help us build more sustainably for the future.

Egypt has unveiled dozens of new archaeological discoveries at a Pharaonic necropolis just outside of the capital Cairo. The excavation team said Thursday that the items lay beneath an ancient stone enclosure within the necropolis and date back to the fifth and sixth dynasties of Egypt's ancient Old Kingdom. The antiquities were unearthed during a year-long excavation. One of the uncovered tombs belonged to a priest from the fifth dynasty, while the other larger tomb belonged to an officer once known as the Pharaoh's "keeper of the secrets." Other major findings from the excavation included a sarcophagus, statues and amulets. Egypt often publicly touts its ancient discoveries to attract more tourists.