No snark or anti-commercialism rantings here, just a dose of simple sweetness. We asked readers to share their most memorable Valentine's Day cards; here are a few of our favorites, edited for length ...

You can draw a heart in Photoshop by drawing it freely with the paintbrush, by creating paths with the pen tool or by sculpting an imported shape using the eraser. But the easiest way to add a heart ...

Researchers in Spain have created a high resolution atlas of the heart with 3-D images taken from 138 people. The study demonstrates that an average image of an organ along with its variations can be ...

A feature of the human heart first sketched 500 years ago by Leonardo da Vinci is finally understood by scientists. Leonardo sketched the mesh-like structure trabeculae inside the organ and speculated ...

Researchers at Pompeu Fabra University (Spain) have created a high resolution atlas of the heart with 3D images taken from 138 people. The study demonstrates that an average image of an organ along ...