IBM says it has made the tiniest stop-motion movie ever - a one-minute video of individual carbon monoxide molecules repeatedly rearranged to show a boy dancing, throwing a ball and bouncing on a trampoline.

Each frame measures 45 by 25 nanometers - there are 25 million nanometers in an inch - but hugely magnified, the movie is reminiscent of early video games, particularly when the boy bounces the ball off the side of the frame accompanied by simple music and sound effects.

The movie is titled, "A Boy and His Atom."

Videos showing atoms in motion have been seen before but Andreas Heinrich, IBM's principal scientist for the project, said Tuesday this is the first time anything so small has been maneuvered to tell a story.

"This movie is a fun way to share the atomic-scale world," Heinrich said. "The reason we made this was not to convey a scientific message directly, but to engage with students, to prompt them to ask questions."

Jamie Panas of Guinness World Records said Guinness certified the movie as "Smallest Stop-Motion Film."

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The stock market has recovered all the ground it lost over the previous two weeks, when worries over slower economic growth, falling commodity prices and disappointing quarterly earnings battered financial markets.

The S&P 500 index rose 11.37 points to close at 1,593.61. The 0.7 percent increase nudged the index above its previous closing high of 1,593.36, reached on April 11.

"The market has had a terrific run," said Philip Orlando, chief equity strategist at Federated Investors, noting that the S&P 500 is up 12 percent since the start of 2013. "At the beginning of the year, I thought we were going to 1,660 (for the whole year). We're only about 5 percent from that."

A pair of better economic reports gave investors some encouragement. Wages and spending rose in the U.S. last month, and pending home sales hit their highest level in three years.

The Dow Jones industrial average rose 106.20 points to 14,818.75, up 0.7 percent. Microsoft and IBM were among the Dow's best performers, rising more than 2 percent each.

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