A perfectly centered slice through the heart of an orange reveals nature’s symmetry in the quietest, most satisfying way.

NASA astronaut Matthew Dominick enjoys a fresh delivery of orange and other fruit on the International Space Station during Expedition 71. CreditC: NASA | edited by Space.com's Steve Spaleta ...

This delicious marmalade takes three days to make, but the end-result is worth it: a batch of perfectly balanced sweet, bitter and tart marmalade.