use a fine-tipped brush or a nail art pen to draw on the skeleton details. Try these Saviland pens ($15). Begin at the spine midway on the nail, then draw a horizontal line under the spine and ...

An artist's illustration of Dendromaia unamakiensis, a 310-million-year old land-dwelling vertebrate that looked a like a modern monitor lizard ... old tree was a neat line of vertebrae, sprouting ...