Mathematical study of change; small pebble

Small flying insect that bites and sucks blood

Pad of paper used to write information down

Helmut Ruska set the basis for the __ microscope

To soak food in seasoning before cooking

We get less of this in autumn compared to summer

Unsettles disturbs

Deep blue; the birthstone of September

Coffee extracted in small concentrated amounts

Aerial military combat; no canines to be seen