Ἀμαθίην κρύπτειν ἄμεινον

Figured that instead of focusing on the launch of Apollo 15 on this date in '71, I'd take a look at one of the pivotal events in exploration and science from the mission.  Chaikin described it thus:

Scott and Irwin’s attention was riveted to the strange, white rock Irwin had seen earlier. As they approached, they strategized about the best way to collect it. Irwin suggested lifting it off its dusty pedestal with the tongs. Scott did so, and he raised it to his faceplate to inspect the find, which was about the size of his fist. It looked fairly beaten up, and it was covered with dust, but as he grasped it with his gloved fingers some of the ancient coating wiped off, and he could see crystals: large, white crystals. Suddenly— 

“Ahhh!” 

“Oh, man!” 

—both men realized what they had discovered. The rock was almost entirely plagioclase. Exposed to light for the first time in untold eons, its white crystals glinted in the sun, like the ones they had seen in the San Gabriels. This was surely a chunk of anorthosite, a piece of the primordial crust. Scott radioed the news. 

“Guess what we just found. Guess what we just found. I think we found what we came for.” 

“Crystalline rock, huh?” prompted Irwin. 

“Yes, sir,” said Scott. 

“Yes, sir,” repeated Joe Allen, like a brother at a revival meeting. After describing the rock in detail, Scott placed it in a special sample bag by itself. Of all the rocks brought back from the moon this one would be the most famous. To the geologists, it would be sample number 15415, but to the world it would be known by the name bestowed upon it by a reporter covering the mission at the space center: the Genesis Rock. 

In time, probing the treasure with electron beams in their laboratories, the geologists would peg the rock’s age at 4.5 billion years. If the moon was any older than that, it wasn’t much older; the solar system itself was thought to have formed only 100 million years earlier. 

Scott couldn’t hear the geologists’ ecstatic reactions in the back room, but he didn’t need to. And Spur had even more to offer.

Kids in a candy shop:

As they made their way along the crater rim they happened on one remarkable find after another, poking out of the dust. Scott sounded like a rare-coin collector who had stumbled across a treasure chest in the attic. “Oh, look at this one!” Scott told Allen what was already clear: “Joe, this crater is a gold mine!” 

“And there might be diamonds in the next one,” said Allen, a gentle reminder that Scott and Irwin could not linger here. They were getting close enough to their immutable walkback limit that Allen was telling them to press on. Now Allen radioed that Irwin’s sample bag was about to come loose—everyone in mission control could see that on the big screen, and they worried that all those priceless samples might tumble into Spur crater. 

Precious minutes were lost as Scott cinched it up. With less than 15 minutes remaining, Scott and Irwin looked hopefully at a boulder that lay perhaps a dozen yards farther along Spur’s rim, the only large rock in sight, and therefore the only rock for which the geologists could be sure of its place of origin. Undoubtedly it had been torn from the floor of Spur. 

Just now, Allen passed up word from the back room: forget the boulder; they wanted them back at the Rover, using the rake to collect a bunch of walnut-sized fragments. Scott eyed the boulder. He told Irwin to go ahead and start raking; in the meantime he went into high gear. A short run along Spur’s rim brought him to his quarry. Working on stolen time, he clicked off Hasselblad pictures of it from every angle. 

There wasn’t time to hammer off a piece, but he spotted a small fragment in the dust—obviously knocked loose from the big rock—and got his sample after all. He hoped the geologists would be able to figure out where it came from by studying the pictures. Scott turned and ran back to join Irwin in his work. He hated to leave. It was a frustration he would feel again and again on the moon, just as he had that first day in the Orocopias with Silver: there was never enough time.

This is one of my favorite missions ever.  Looking forward to seeing astronauts getting dirty again on the lunar surface, lighting new fires in our imagination and expanding our understanding of the cosmos.