Those that disputed the flat earth theory counterexample the claim by observing that Christopher Columbus was able to sail around the earth without falling off the deep edge and later by presenting satellite imagery taken from space of a spherical earth

tracks, burrows, eggshells, nests, tooth marks, or gastroliths

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?