Endeavour Crater - These two craters are actually inside Endeavour Crater, which is about 22 kilometers in diameter. These craters are close the southern rim of the larger crater. Opportunity arrived at Endeavour in 2011.
Plague is an infectious disease caused by bacteria. These cufflinks contain pictures of two different strains of these bacteria. The names of the strains are engraved on the back. The plague-causing bacteria were discovered in 1894. It is believed that these cufflinks were made by Fabergé, the celebrated Russian jeweller. The use of these images on the cufflinks suggests the pride taken in the discipline of bacteriology. Via