Sand grains from Maui, Hawaii. These were the first grains of sand that I examined through the microscope. I was amazed by the array of spectacular bits and pieces. The "Y" shaped glassy structure at the top is a sponge spicule, which functions as the internal skeleton of most sponges. Just to the left and down are two perfectly formed microscopic shells. Just to the right and down from the sponge spicule is a bit of brown sea urchin spine, with its intricate structural design
This cell is preparing to divide. Two copies of each chromosome (blue) are lined up next to each other in the center of the cell. Next, protein strands (red) will pull apart these paired chromosomes and drag them to opposite sides of the cell. The cell will then split to form two daughter cells, each with a single, complete set of chromosomes.