Two Pennsylvania students joined their peers from around the country today at the White House Science Fair. Students were invited to show off the work that won them National Science, Technology, Engineering and Math Competitions.

Chances are your science fair project was a little less life-changing than what these students put together.

Benjamin Hylak is from West Grove, Pa., but attends Salesianum High School in Wilmington. The 14-year-old created a robot that helps seniors who can't visit family and friends to connect with their loved ones via Skype.

Marian Bechtel of Hempfield High School in Lancaster has designed an affordable tool to detect abandoned landmines. The 17-year-old's project has already won recognition from the Intel International Science and Engineering Fair, the American Intellectual Property Law Association, the Society of Exploration Geophysicists, the U.S. Army and the Intel Science Talent Search.

Hylak, Bechtel and the rest of the students visited with space, technology, medical and environmental officials at the fair.