SpaceX has some nice before-and-after photos to mark the 10th launch of one of its Falcon 9 rockets, thanks to a satisfied customer.
The use of "anno domini" and "before Christ" to mark time began in the early days of Christianity, when clerics needed to know when Easter would fall.
The test chamber will enable scientists to test technologies and structures on Earth before sending them to the moon.
Mesopotamians were using hybrids of domesticated donkeys and wild asses to pull their war wagons 4,500 years ago, scientists have found.