Piet Mondrian painted the same tree in “The gray tree” (left) and “Blooming apple tree” (right). Viewers can readily discern the tree in “The gray tree” with a branch diameter scaling exponent of 2.8.

Real Christmas trees fill your home with the sweet smell of pine. It’s a great way to get into the holiday spirit. What’s not so merry is what could be lurking within the tree. Depending on ...

Christian von Burgsdorff runs a Christmas tree company and says that, "we don't have enough goods to keep up with Chinese demand." 28 million Christmas trees were sold in Germany last year (the ...