about for weeks now."

"Well," said Strong with a smile, "we're going!"

The three cadets couldn't restrain themselves and burst out in a happy shout. Then Roger calmed down enough to comment, "Sounds more like another vacation than an assignment, sir."

"Hardly, Manning," replied Strong. "You see, every industry, society, organization, and governmental agency is setting up exhibits at the exposition to show the people what's taking place in their part of the solar system. There'll also be an amusement section." Strong chuckled. "I've seen pictures of some of the tricks and rides they've developed to entertain the younger generation. Believe me, I'd rather take full acceleration on a rocket ship than ride on any of them."

"But what will we do, sir?" asked Tom.

"Our job is very simple. We're to take the Polaris to the exposition and land on the fairgrounds. When the fair opens, we show all the visitors who are interested, everything about her."

"You mean we're going to be"—Roger swallowed—"guides?"

"That's right, Manning," said Strong. "You three will guide all visitors through the Polaris."

"How long will we be there, sir?" asked Tom.

"A month or so, I guess. The Polaris will be the first Academy exhibit. When you leave, another unit will replace you with their ship and do the same thing."

"But—but—" stammered Astro, "what will we say to them? The visitors, I mean?"

"Just answer all their questions, Astro. Also, make up a little speech about the functions of your particular station."

Strong looked at his watch and rose to his feet. "It's getting late. Check the Polaris over and stand by to raise ship in an hour."

"Yes, sir," said Tom.

The cadets came to attention, preparing to leave.

"One thing more! Don't get the idea that this is going to be a space lark," said Strong. "It's very important for the people of the Solar Alliance to know what kind of work we're doing here at the Academy. And you three have been selected as representatives of the entire Cadet Corps. So see that you conduct yourselves accordingly. All right, 

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