<p>An ocean inside the Earth and a paralyzed man kicks off the World Cup — just the beginning of the cool stories in Science this week.</p><p>Click on!</p>
Found! Ocean locked up deep in Earth
<p>Deep within the Earth's rocky mantle lies oceans' worth of water locked up in a type of mineral called ringwoodite, new research shows.
</p><p>The results of the study will helpscientists understand Earth's water cycle, and how plate tectonics moves water between the surface of the planet and interior reservoirs, researchers say.
</p><p>[Full Story: <a href="http://www.livescience.com/46292-hidden-ocean-locked-in-earth-mantle.html" target="_blank">Found! Hidden Ocean Locked Up Deep in Earth's Mantle</a>]</p>
Moon formed earlier than thought
<p>Earth's moon sprung to life much sooner than scientists thought, new research suggests.</p><p>Previously, scientists had pinned down the moon's birth at 100 million years after the solarsystem formed 4.568 billion years ago. New findings push back the moon's birth date to just 40 million years after the solar system coalesced, researchers said yesterday (June 10) here at the annual Goldschmidt geochemistry conference.
</p><p>[Full Story: <a href="http://www.livescience.com/46224-moon-age-gets-younger.html" target="_blank">Earth-Moon Smashup Happened Earlier Than Thought</a>]</p>
Evidence of ancient hippo swim
<p>More than a million years ago, hippopotamuses paddled across a shallow pool in the region that's now northern Kenya, occasionally scraping their feet on the sandy bottom. Today, researchers have evidence of the hippos' fleeting swim in the form of fossilized footprints.
</p><p>The newly identified printsrepresent the first known tracks of ancient mammals taking a dip, joining previously discovered trace fossils left behind by swimming dinosaurs, turtles and crocodiles, the researchers said.</p><p>[Full Story: <a href="http://www.livescience.com/46286-swimming-hippos-fossil-tracks.html" target="_blank">Million-Year-Old Fossils Show Hippos Going for a Swim</a>]</p>
Ancient Mayan artwork discovered
<p>A team of archaeologists in Guatemala has discovered a council house dating back about 700 years with altars, incense burners and sculpted images of animals.
</p><p>Located at the site of Nixtun-Ch'ich' in Petén, Guatemala, the house has "two colonnaded halls constructed side by side. The halls were decorated with sculpted [reptile], parrot and turtle imagery," writes Timothy Pugh, a professor at Queens College in New York, in a summary of a talk he recently gave at the Society for American Archaeology annual meeting in Austin, Texas.
</p><p>[Full Story: <a href="http://www.livescience.com/46215-ancient-mayan-artwork-discovered.html" target="_blank">Ancient Mayan Altars, Sculpted Artwork Discovered in Guatemala</a>]</p>
Mystery disease turns starfish to goo
<p>A mysterious disease that is turning sea stars to goo has taken off along the Oregon coast, with up to half or more of the creatures being infected in just the last few weeks, scientists say.
</p><p>Until now, Oregon was the one state along the U.S. West Coast essentially spared from the disease. In April, researchers estimated less than 1 percent or so of the purple ochre sea stars (<i>Pisaster ochraceus</i>) living within 10 sites along Oregon's intertidal zones — which provide an easily accessible place to monitor sea stars — were affected by the wasting disease. By mid-May that percentage had gone up slightly, and then after that it seemed to skyrocket.
</p><p>[Full Story: <a href="http://www.livescience.com/46188-mystery-disease-devastates-sea-stars.html" target="_blank">Mystery Disease Turns Oregon's Sea Stars to Goo</a>]</p>
Condom use drops in US teens
<p>The percentage of sexually active teens who use condoms has declined over the last decade, according to a new report from the Centers for Disease Control and Prevention.
</p><p>In 2013, 59 percent of high school students who had sex in the last three months said they used a condom during their last sexual encounter, down from 63 percent in 2003, the report said.</p><p>[Full Story: <a href="http://www.livescience.com/46296-teen-condom-use.html" target="_blank">Condom Use Drops Among US Teens</a>]</p>
Cool kids don't stay cool forever
<p>The "cool kids" in middle schoolmay not be so cool when they grow up: A new study suggests these once-popular teens are at greater risk for relationship and drug problems in adulthood.
</p><p>The study researchers followed 184 teens from when they were 13 (in seventh and eighth grade) until they were 23, and asked participants a number of questions about their lives, including whom their close friends were, which peers they thought were popular, and whether they'd used drugs or had a romantic relationship.
</p><p>[Full Story: <a href="http://www.livescience.com/46281-when-cool-kids-become-adults.html" target="_blank">'Cool Kids' Don't Stay Cool Forever, Study Suggests</a>]</p>
Paralyzed man takes first World Cup kick
<p>The honor of first kick of the 2014 FIFA World Cup went not to Brazilian soccer star Neymar, but to 29-year-old Juliano Pinto, who is paralyzed from the waist down.
</p><p>In a much-hyped demonstration at the tournament's opening ceremony yesterday (June 12) at the Corinthians Arena in Sao Paulo, Brazil, Pinto made the kick while wearing a robotic exoskeleton controlled by his brain. But those viewing it at home got only a brief glimpse of Pinto performing the ceremonial kick before the cameras rolled back to singer Jennifer Lopez and the day's other entertainers.
</p><p>[Full Story: <a href="http://www.livescience.com/46317-world-cup-paralyzed-man-exoskeleton.html" target="_blank">Paralyzed Man Takes First Kick of 2014 World Cup</a>]</p>